Tag: concentration

Why the Same Perfume Costs Wildly Different Amounts

The same fragrance can carry very different prices because it reaches the buyer through different channels. Authorized distribution builds in brand-set margins; parallel imports, closeouts, testers and unboxed units do not. Size, concentration, batch age and seasonal repricing explain most of the rest. Below a certain point, a low price stops signaling channel and starts signaling counterfeit.

Why does one retailer charge twice what another does for the same bottle?

Because the bottle took a different route to the shelf. A department store buys from the brand’s authorized distributor at agreed terms and is supported in return with training, testers, display furniture, cooperative advertising and a returns allowance. All of that is funded out of the price. A discounter often buys from a secondary source: stock a distributor in another market over-ordered, inventory from an account that closed, a reference the brand discontinued, or a parcel routed around the brand’s own price structure. The bottle is identical. The cost of getting it in front of you is not, and neither is the set of obligations attached to selling it.

That is the whole mechanism, and it is worth being blunt: most of the price difference between a department store and an online discounter is not a difference in the product. It is a difference in who paid for the retail experience.

What is the grey market, and is it legal?

Grey market, also called parallel import, means genuine branded goods sold outside the brand’s authorized distribution network. It is not counterfeit, and in the United States it is generally lawful.

The Second Circuit has stated the underlying principle directly: “Trademark law does not reach the sale of genuine goods bearing a true mark even though the sale is not authorized by the mark owner.” Once a brand has sold a bottle, it has generally exhausted its right to control who resells that bottle. This is the same first-sale logic that lets you resell a book or a car.

The Supreme Court applied the copyright version of the rule to exactly this kind of case in Quality King Distributors v. L’anza Research International. L’anza made hair care products with copyrighted label artwork and sold to foreign distributors at prices 35% to 40% below what it charged domestic ones. Product sold to a distributor in Malta made its way back into the United States and was resold through unauthorized retailers at discounted prices. The Court held the first sale doctrine applied, and that the importation right was limited by it. Once L’anza sold the goods, it had exhausted its distribution right, and subsequent owners could resell them in the US.

Two conclusions follow. A discounter selling genuine parallel stock is not doing anything unlawful, and a brand’s disapproval is not evidence a bottle is fake. Equally, grey market is not a synonym for bargain: it describes where a bottle came from, not whether it is good value.

How much does parallel distribution actually change the price?

The Quality King record gives an unusually concrete answer, because the price gap was litigated. L’anza charged its foreign distributors 35% to 40% less than its domestic distributors for identical product.

That gap is the reseller’s entire working capital. Everything the shopper eventually sees as a discount has to come out of it, alongside freight, import costs, currency risk, the reseller’s own margin and the retailer’s margin. Run the arithmetic with illustrative numbers to see how it lands. Suppose domestic distributor cost is $100 and the foreign equivalent is $62.50, the midpoint of that documented range. The parallel chain has $37.50 of headroom per unit. If it keeps two thirds of that as margin and cost recovery, the shopper sees roughly $12.50 off a $100 basis, or about 12%. If it keeps a third, the shopper sees about 25%.

Those are illustrative figures, not measurements, and they are here to make one point: a documented 35% to 40% gap at the distributor level supports a consumer discount in the region of 10% to 30%, not 80%. When a discount is dramatically larger than the channel gap can fund, the explanation is somewhere other than distribution. That usually means condition (tester, unboxed, damaged carton), age (old batch, discontinued reference), volume (a decant sold as a bottle), or counterfeit.

When is a parallel import actually a different product?

Sometimes it genuinely is, and US Customs has a formal process for that situation. This is the part of the grey market most buyers have never heard of, and the one that occasionally explains a real difference between two bottles bearing the same name.

Customs regulations restrict the importation of gray market articles that are physically and materially different from those the US trademark owner authorized for sale here. A trademark owner claiming that protection must state the basis with particularity and support it with competent evidence. The regulation lists what Customs will consider, including the specific composition of both the authorized and gray market product including chemical composition; formulation, product construction or composite components; performance and operational characteristics; differences resulting from legal or regulatory requirements and certification; and other explicitly defined factors likely to result in consumer deception.

Goods found to be materially different can still be imported, but only if labelled. The required statement is prescribed word for word: “This product is not a product authorized by the United States trademark owner for importation and is physically and materially different from the authorized product.” It must be conspicuous, legible, and placed in close proximity to the trademark as it appears in its most prominent location.

If you ever see that sticker on a fragrance carton, it is not a counterfeit warning. It is the opposite: a legally imported parallel unit, disclosed as required. It does tell you the US trademark owner has established that this version differs in some documented way from the version it authorizes for sale here, which is worth knowing before you compare prices. Most parallel fragrance in the US carries no such label, because most of it has not been found materially different.

Are you comparing the same size and the same concentration?

A large share of apparent price chaos is a comparison error rather than a market phenomenon, and two variables cause most of it.

Concentration comes first. Eau de toilette and eau de parfum sold under one name are different products with different material costs and prices. Neither term has a legal definition in the United States: FDA does not define fragrance concentration terms and does not approve fragrance products before they go on the market. The brand decides what to call a concentration and what to charge, so the only reliable reading is the concentration printed on the listing in front of you.

Size compounds it, because price per millilitre almost always falls as the bottle gets larger. A bigger bottle that looks expensive next to a small one is frequently the cheaper purchase.

Listing (illustrative figures)	Total price	Price per ml	Which is actually cheaper
30 ml eau de parfum	$72	$2.40	Most expensive per ml
50 ml eau de parfum	$95	$1.90	Middle
100 ml eau de parfum	$135	$1.35	Cheapest per ml, highest total
100 ml eau de toilette	$110	$1.10	Cheapest overall, but a different product

The figures above are an illustration of the arithmetic rather than any real product’s prices. The habit is what matters: convert every candidate to a price per millilitre, then check that you are comparing the same concentration, before you draw any conclusion at all. Our own catalogue makes the trap concrete. The median eau de parfum we list works out to about $0.88 per ml and the median eau de toilette about $0.59, which looks like a 49% premium for the stronger concentration. It is not. Those two medians describe different fragrances from different brands, and when you narrow to the 73 fragrances we stock in both concentrations, the same-name premium is about 13% per millilitre. The catalogue-wide gap is mostly telling you that expensive brands favour eau de parfum, which is a fact about brand positioning rather than about concentration.

What actually moves the price?

Driver	Typical effect on price	How to verify it
Authorized versus parallel distribution	Large. Manufacturer price discrimination between markets has been litigated at 35% to 40% at distributor level	Check whether the retailer claims authorized status; compare three established sellers
Size	Price per ml usually falls as size rises	Convert every listing to price per ml before comparing
Concentration	Eau de parfum normally costs more than eau de toilette of the same name	Read the concentration on the listing, not the fragrance name
Condition: tester or unboxed	Lower than sealed retail for the same volume	The listing should state the condition in words
Batch age	Older stock is usually discounted	Ask for the batch code and look it up
Discontinuation	Can move either way; sought-after discontinued references appreciate	Check whether the brand still lists the reference
Reformulation	Older formulations of some references trade above current stock	Compare batch codes and packaging generation
Seasonal repricing	Short-lived; heaviest around gifting peaks	Track the same listing for two weeks before buying
Import and shipping costs	Rising where low-value parcel exemptions have been withdrawn	Check where the item ships from and whether duties are quoted

Does an older batch justify a lower price?

Usually yes, and how much depends on the fragrance rather than on the calendar. Volatile top notes, typically citrus and light aromatics, degrade first. Woody, resinous and oriental compositions tolerate age comparatively well. A peer-reviewed review of essential oil stability found compositional change proceeding considerably faster under illumination than in darkness, and notes that a temperature rise of 10 degrees Celsius approximately doubles chemical reaction rates, which is why storage history matters more than the printed date.

Brands that discuss shelf life publicly give ranges rather than deadlines. Creed’s guidance is three to five years once opened, ideally used within two to three, with unopened bottles lasting considerably longer because they have had no exposure to oxygen. There is no US requirement for any of this to appear on a label: FDA states there are no US laws or regulations requiring cosmetics to have specific shelf lives or expiration dates, and calls shelf-life determination the manufacturer’s responsibility.

So a discount on older stock is rational, and it should be larger on a citrus cologne than on an aged oud. Discontinuation cuts the other way: once a reference is gone, remaining stock can appreciate, and sought-after discontinued bottles routinely sell above original retail.

What do “MSRP” and “list price” discounts actually mean?

Less than the percentage suggests, and the FTC has said so for decades. The Guides Against Deceptive Pricing set out three relevant rules.

On a retailer’s own former price, a comparison is legitimate only where the former price “is the actual, bona fide price at which the article was offered to the public on a regular basis for a reasonably substantial period of time.” Where no sales actually occurred at that price, the advertiser must still be able to show the product was “openly and actively offered for sale, for a reasonably substantial period of time, in the recent, regular course of his business.”

On comparisons with competitors, the advertised higher price “must be based upon fact, and not be fictitious or misleading,” and should reflect substantial sales at principal retail outlets rather than isolated small ones.

On manufacturer list prices, the Guides are blunt: a list price is a valid comparison only where “it is the price at which substantial (that is, not isolated or insignificant) sales are made in the advertiser’s trade area.” They also state that a manufacturer “may not affix price tickets containing inflated prices as an accommodation to particular retailers who intend to use such prices as the basis for advertising fictitious price reductions.”

The practical consequence is simple. Ignore the struck-through number. Build your own reference range from what several established retailers charge today, and measure every offer against that rather than against a figure the seller supplied.

How do import rules and shipping change the price?

They have moved, and they are now part of the answer to why identical bottles diverge. CBP processed more than 1 billion shipments under the de minimis value exemption in fiscal 2023, a channel that allowed low-value parcels to enter with minimal data and minimal cost. By March 2024, CBP reported that 85% of its cargo seizures originated as de minimis shipments. An April 2025 executive order closed that route for parcels from China and Hong Kong, requiring shipment details to be reported to CBP and duties to be paid regardless of value.

Two consequences matter at the checkout. A very low price supported by a duty-free direct-from-overseas parcel is a thinner proposition than it was, and a quoted price that excludes duties may not be what you end up paying. And delivery is part of the comparison, not a footnote: a listing that is $8 cheaper and charges $14 for delivery is not cheaper. Free delivery is common in US fragrance retail but it is not universal, minimum-order thresholds vary, and remote states frequently attract a surcharge, so put one landed total next to the other before you decide.

How low is too low?

There is no single threshold, but there is a shape to it, and the shape follows what each explanation can actually fund.

Gap below established retail	What it plausibly means	What the listing should say
0% to 20%	Ordinary promotional or competitive pricing	Nothing unusual required
20% to 40%	Parallel import, closeout, or an online discounter’s normal margin	Condition of the unit; an identifiable seller
40% to 70%	Tester, unboxed, discontinued reference, or noticeably older batch	The specific condition, named in words
More than 70% on a current release	Counterfeit, or a decant or split sold as a full bottle	No explanation is usually offered, which is itself the answer

These bands are a rule of thumb drawn from how the discount market behaves, not a measured statistic. The FBI lists significantly lower pricing among its counterfeit indicators, so the deepest band deserves the most suspicion. The other thing a very low price can signal is volume: a 100 ml listing priced like a 10 ml one is often a decant or a split, meaning liquid transferred by a third party into another container. Plenty of Perfumes does not sell decants or split bottles in any form.

How to compare two prices properly

Write down the exact reference: brand, fragrance name, concentration and size in millilitres.
Convert each candidate price to a price per millilitre. Compare those numbers, not the totals.
Confirm both listings are the same concentration. If one is eau de toilette and one is eau de parfum, you are not comparing prices, you are comparing products.
Note the stated condition of each unit: sealed retail, tester or unboxed. An unstated condition is a gap in the information, not a bargain.
Add delivery, any remote-state surcharge, and any duties the quoted price excludes.
Read both return policies, including who pays return postage on a change of mind and whether a restocking fee applies.
Ask for the batch code where the seller will share it, so you know roughly how old each unit is.
Check where each ships from, since a direct overseas parcel carries different duty and delivery risk from domestic inventory.
Only now look at the MSRP, and treat it as marketing rather than as a reference price.

What price alone cannot tell you

Price cannot tell you whether a bottle is genuine, and this is the most important limit of all because it cuts both ways. Counterfeit sellers price high as well as low, precisely because buyers use price as a proxy for authenticity. A fake sold at 25% off looks exactly like legitimate grey-market stock on a search results page, and a fake priced at full retail on a professional-looking site defeats the low-price heuristic entirely. Price is a screening signal, not a verdict.

The inverse belief is equally wrong. Buying from an authorized retailer buys you brand-supported service, returns handling and, where a brand offers one, access to its own goodwill. It does not mean that an unauthorized retailer is selling something different. Both can be selling identical bottles from the same production run, and courts have repeatedly confirmed that reselling genuine goods outside the authorized network is lawful in general terms.

Price also cannot tell you how a bottle was stored, which frequently matters more than how old it is. It cannot tell you whether a reference has been quietly reformulated, since brands rarely announce that and packaging often does not change. It cannot tell you whether a parallel unit was produced to a different market specification, unless it carries the Customs label that says so. And it cannot tell you the seller’s identity, which is the variable most worth resolving before you pay.

What a price can usefully be paired with is disclosure. Condition is the part of a listing that does most of that work: across the 3,832 bottles we currently list, about 93% are sealed retail units, around 5.6% are marked as testers and about 1.4% as unboxed. A price attached to a stated condition is a comparable price. A price attached to no condition at all is a number without a unit, and no amount of arithmetic will fix that.

Bottles to try this on

Fragrances where running the like-for-like comparison above is most worth the five minutes: Dior Sauvage Eau de Parfum, Coco Mademoiselle, Creed Aventus, Jean Paul Gaultier Le Male, Tom Ford Tobacco Vanille, Acqua di Gio in its largest format.

Common questions

Why is the same perfume so much cheaper on some websites?

Usually because the bottle reached that seller outside the brand’s authorized distribution. Brands charge different prices in different markets, so genuine stock bought abroad, from a closed account or from a discontinued line can be resold below US retail. Testers, unboxed units and older batches sit lower again. The liquid is the same; the route is not.

Is grey market perfume fake?

No. Grey market means genuine branded goods sold outside the authorized network, and in the United States it is generally lawful. What can differ is specification: US Customs restricts import of parallel goods found physically and materially different unless they carry a prescribed label saying so. Grey market is a channel question, not an authenticity question.

Does a much lower price always mean a counterfeit?

No, but it is the strongest single warning signal the FBI lists. Discounts of 20% to 40% below department store pricing are routine for genuine parallel and closeout stock, and deeper cuts are plausible for testers, unboxed bottles and discontinued references. A current release at a fraction of everyone’s price with no stated condition is the pattern to avoid.

Why does eau de parfum cost more than eau de toilette?

Because it normally carries more fragrance material per bottle, which costs the brand more to make. Neither term has a legal definition in the United States, and FDA does not define concentration names or approve fragrance products before sale. The brand sets both the designation and the price, so compare concentrations explicitly rather than by name.

Should I trust a big discount off MSRP?

Treat it as marketing. The FTC’s pricing guides say a list price is a legitimate comparison only where substantial sales actually occur at that price in the advertiser’s trade area, and warn against inflated price tickets used to advertise fictitious reductions. Build your own reference range from what several established retailers charge today.

Does an older batch mean a worse bottle?

Not automatically, and sometimes the opposite. Age matters most for citrus-led and delicate floral compositions, whose top notes fade first, and least for woody, resinous and oriental ones. Storage matters more than the date. Some discontinued or reformulated references trade above current stock precisely because collectors want the older batch.

Is it worth paying more to buy from an authorized retailer?

Sometimes, and for reasons other than authenticity. What you buy is brand-supported service, returns handling and access to any goodwill the brand offers. You are not buying a different bottle: reselling genuine goods outside the authorized network is lawful in general terms, and both channels can be selling stock from the same production run.

Why do prices jump around during the year?

Because fragrance is heavily gift-driven, so promotional pressure clusters around gifting peaks and eases afterwards. Parallel and closeout supply also arrives in irregular batches rather than continuously, which makes discounter pricing move more than department store pricing. Watching a single listing for two weeks before buying usually reveals whether a price is a floor or a promotion.

Do tariffs and import rules affect what I pay?

Increasingly. CBP processed more than 1 billion low-value de minimis shipments in fiscal 2023, and an April 2025 executive order closed that exemption for parcels from China and Hong Kong, requiring shipment details and duties regardless of value. A quoted price that excludes duties on a direct overseas parcel may not be the final price.

Is a very expensive listing more likely to be genuine?

No, and assuming so is a common mistake. Counterfeit sellers price high as well as low, because they know buyers read price as a proxy for authenticity. A fake at full retail on a polished website defeats the low-price heuristic completely. Use price to screen, then verify the seller’s identity, the stated condition and the batch codes.

September 14, 2026

Sillage, Projection and Longevity: What the Three Words Mean

Longevity is how long a fragrance stays detectable. Projection is how far it carries from your skin at a given moment. Sillage is the trail it leaves behind you as you move. They are independent: a fragrance can last ten hours and project for one. Longevity comes from low-volatility materials, projection from volatile ones with low detection thresholds.

Those three words get used interchangeably in reviews, which is why reviews of the same bottle so often contradict each other. Separating them makes the contradictions disappear.

What do sillage, projection and longevity actually mean?

None of the three is a technical term. Inside the industry, perfume performance is described with a different vocabulary: impact is the immediate olfactory sensation, tenacity is persistence near the source over time, diffusion is how effective the fragrance is at some distance from the source, and volume is its effectiveness across both time and distance together.

Consumer vocabulary maps onto that imperfectly. Sillage is a French word for the wake a ship leaves in water, borrowed to describe the trail of scent a moving person leaves behind. Projection is a static measure — how far the scent reaches right now. Longevity is duration. The table below lines the two vocabularies up.

Consumer term	Closest technical term	What it measures	What drives it	How to observe it on yourself
Longevity	Tenacity	Duration for which the fragrance remains detectable at all	The proportion of low-volatility materials: musks, amber materials, woods, resins, and fixatives that slow the evaporation of everything above them	Sniff the sprayed spot directly at fixed intervals. This is the one of the three you can judge on yourself with some reliability
Projection	Diffusion	Distance from the skin at which the fragrance is detectable at a given moment	Materials that are both volatile enough to fill the surrounding air and detectable at very low concentrations	Ask someone at conversational distance. You cannot assess this on yourself
Sillage	Diffusion combined with air movement	The persistence of a scent trail in space after you have moved through it	The same materials as projection, plus how much you applied and how much you move	Ask someone who entered a room after you left it
“Beast mode”	Volume	High effectiveness across time and distance at once	A composition carrying both a strong diffusive fraction and a heavy low-volatility base	Both of the above, on separate days
“Skin scent”	High tenacity, low diffusion	Long duration, short reach	Low-volatility materials with unremarkable detection thresholds; many musk-led compositions behave this way	Long detectable at the wrist, undetectable at arm’s length

Why are they independent of each other?

Because the physical properties that produce each one pull in opposite directions.

The usable model is the odour value: for any single material, perceived intensity depends on its concentration in the air divided by its odour detection threshold. The air concentration in turn depends on how much of the material is present and on its vapour pressure. Written as a chain, intensity rises with the amount present, rises with volatility, and falls as the detection threshold rises.

Projection needs volatility. A material has to get into the air in quantity to be detected three feet away. High vapour pressure does that.

Longevity needs the opposite. A material that evaporates quickly is gone quickly. Persistence requires low vapour pressure — materials that release slowly over hours.

A material cannot be simultaneously very volatile and very persistent. So a fragrance that projects hard for an hour and then sits close to the skin for nine more is not malfunctioning. It is a composition with a diffusive top structure over a low-volatility base, behaving exactly as designed.

The third variable breaks the pattern further. Detection thresholds differ between materials by orders of magnitude, not percentages. Published compilations report vanillin detectable down to around 0.00000016 ppm at the low end of reported values, against ammonia from 0.043 ppm and benzene from 0.47 ppm. A material with an extremely low threshold can project strongly while present in trace quantities, and a material present in bulk can be almost imperceptible if its threshold is high. Weight in the bottle and loudness in the room are not the same measurement.

Behaviour you notice	Most likely cause	What it is not
Strong for an hour, then close to the skin all day	Diffusive volatile materials over a low-volatility base. Very common and usually intentional	Not a fake, a bad batch, or an application error
Quiet from the start but still there twelve hours later	A musk- or wood-led composition with few high-threshold diffusive materials	Not weak concentration. Concentration and diffusion are different variables
Loud for two hours and then nothing	A volatile-heavy composition with a light base. Common in citrus and aquatic styles	Not evaporation from the bottle or poor storage, unless the bottle is old
Others comment on it but you cannot smell it	Olfactory adaptation to your own fragrance	Not proof that it has faded
Behaves differently on you than on someone else	Skin properties and individual olfactory sensitivity, both of which vary between people	Not a different formulation in your bottle
Performs differently in summer and winter	Vapour pressure rises with temperature, so warm skin and warm air release material faster	Not a seasonal reformulation

Why do two people describe the same fragrance completely differently?

Three separate sources of variation stack on top of each other.

The wearer’s skin. A 2025 study in the International Journal of Cosmetic Science, “Exploring the impact of fragrance molecular and skin properties on the evaporation profile of fragrances,” reports that both the intrinsic molecular properties of the fragrance and the properties of the skin shape how quickly materials leave, with the pattern differing between individuals. Only its title and abstract were reachable, so nothing more specific is claimed from it here. Fragrance does not perform identically on different people. That is the measurable part of why the same bottle behaves differently on other people.

The observer’s nose. Sensitivity is not uniform. A compilation of odour-threshold research reports work by Amoore in which 764 laboratory employees were screened for six types of specific anosmia — an inability to detect one particular odour while smelling normally otherwise — and found rates from 3 percent to 47 percent depending on the odour category, against a general anosmia to all odours of about 0.2 percent. The highest rate, 47 percent, was for the urinous steroid androstenone. The same compilation reports, citing Koelega and the National Geographic Smell Survey, that women are on average more sensitive to odours than men and that sensitivity declines past age 50. These figures reach this article through that compilation rather than from the primary papers, which could not be retrieved, so treat them as reported. The practical point does not depend on the exact numbers: someone who is specifically anosmic to a musk that forms the backbone of a fragrance will report it as having no longevity, accurately, from their own perspective.

The wearer’s own adaptation. Repeated or prolonged exposure to an odorant produces a stimulus-specific decrease in sensitivity to it, recovering over time only once exposure stops, with the magnitude and time course depending on concentration and duration. The effect is not brief. In one study, subjects exposed continuously to an odorant in their homes for two weeks showed elevated detection thresholds and reduced perceived intensity, and for most of them reduced sensitivity was still evident up to two weeks after the last exposure. You are systematically the worst-placed person to judge your own projection and sillage.

How do you measure performance honestly?

Apply a fixed number of sprays and write it down. Two sprays and six sprays are different experiments. Keep it constant across fragrances you want to compare.
Apply to skin, not clothing, for a performance test. Fabric holds fragrance far longer than skin and will flatter longevity. Clothing is fine for wearing, useless for measuring.
Record the time of application. Estimates made afterward drift.
Check longevity by sniffing the sprayed spot directly at set intervals. Thirty minutes, two hours, four, six, eight, twelve. Note whether it is present, not whether it is strong.
Do not try to judge projection on yourself. Adaptation makes the reading meaningless. Ask a specific question of someone else: “Can you smell this from where you are sitting?”
Judge sillage by having someone enter a room after you. That is what sillage describes. There is no way to observe your own wake.
Leave the room for ten minutes and come back before making a final call. Recovery from adaptation is not instant, but a break helps, and longer breaks help more.
Repeat on a second day before concluding anything. Temperature, humidity, skin condition and your own sensitivity all shift. One wearing is an anecdote.

How do you describe what you want without jargon?

The enthusiast vocabulary is a barrier when you are trying to explain what you actually want. Plain descriptions work better, because they specify the behaviour rather than the label.

What you want	How to say it plainly	What to look for
High tenacity, low diffusion	“I want it to last all day but stay close to me”	Musk-, wood- and amber-led compositions. Often described as skin scents
High diffusion, any duration	“I want people to notice it when I walk in”	Compositions with a large diffusive fraction; frequently sweet, fruity or strongly aromatic styles
Low diffusion, short duration	“I want something for the office that will not bother anyone”	Citrus and light floral compositions, applied sparingly. Expect to reapply
Both high	“I want it to last all day and be noticeable”	Heavier compositions with both a diffusive structure and a substantial base. Usually best applied more sparingly than you expect
Predictability over strength	“I want to know what I am getting at hour six”	Simpler compositions with a clearly named base. Test over a full day before buying a large bottle

Which performance myths are wrong?

Myth: sillage and projection are the same thing

The claim: the two words are interchangeable.
What the evidence shows: they describe different measurements. Projection is reach at a moment; sillage is the trail persisting in space after you move through it. The industry’s own vocabulary separates diffusion at a distance from effectiveness over time and distance combined.
What people wrongly conclude: that two reviewers disagreeing about “sillage” are contradicting each other, when they may be describing two different properties accurately.

Myth: a higher concentration always projects further

The claim: EDP projects more than EDT by definition.
What the evidence shows: projection depends on how much diffusive, low-threshold material is in the air. Raising overall concentration raises everything proportionally, but it cannot add diffusive materials that are not in the composition. Brands also frequently reweight rather than simply dilute between concentrations. The concentration chart goes into what the label does and does not control.
What people wrongly conclude: that a quiet EDP is defective.

Myth: if you cannot smell it, it has worn off

The claim: the wearer’s perception tracks the fragrance’s presence.
What the evidence shows: adaptation is stimulus-specific and can be long-lasting. Continuous exposure over two weeks left detection thresholds elevated for up to two weeks afterward in most subjects in one study. Over a single day, you lose sensitivity to your own fragrance long before other people do.
What people wrongly conclude: that they should reapply. In a shared space, this is how overapplication happens.

Myth: performance is a fixed property of the bottle

The claim: a fragrance has a longevity figure, the way a battery has a capacity.
What the evidence shows: reported evaporation profiles vary between individuals, driven by both skin properties and molecular properties. Observer sensitivity also varies: one screening of 764 people found specific anosmia rates from 3 to 47 percent depending on odour category.
What people wrongly conclude: that a reviewer reporting twelve hours and a reviewer reporting three are reporting on different products.

Myth: rubbing your wrists together crushes the molecules

The claim: friction destroys aroma molecules and shortens wear.
What the evidence shows: friction between two wrists does not break chemical bonds. What rubbing actually does is warm the skin, which raises vapour pressure and speeds evaporation, and spread the liquid over a larger area, which increases the surface from which it evaporates. Both shorten the early phase.
What people wrongly conclude: that something exotic is happening. The effect is real; the explanation usually given for it is not.

Myth: more sprays produce proportionally more sillage

The claim: doubling the application doubles the reach.
What the evidence shows: gas-phase concentration scales with how much material is present, so more does mean more. But detection is a threshold phenomenon: once a material is comfortably above threshold for the people around you, further increases raise intensity without extending the useful range in proportion. Meanwhile the people nearest you receive all of the increase.
What people wrongly conclude: that a fragrance which does not project is solved by volume. It is usually solved by a different fragrance.

The honest limits of this article

There is no standard instrument, unit or protocol for consumer-level measurement of any of these three properties. Reported longevity figures, including any you produce yourself, are subjective judgements by a person whose sensitivity to that specific fragrance is declining throughout the measurement. The published research cited here establishes that adaptation occurs, that skin properties affect evaporation, and that olfactory sensitivity varies substantially between people; it does not establish how long any particular fragrance lasts on any particular person, and nothing can. The odour-value framework is a model used in perfume design, and like any model it simplifies. We have not tested, smelled or measured any product named or implied here, and no performance claim in this article should be read as a claim about a specific bottle. The most reliable information available to you is your own repeated wearing, cross-checked with someone else’s nose.

What to do with all of this when buying

Decide which of the three properties you actually care about, because optimising for one often costs you another. If you want all-day presence in a shared office, you want tenacity and low diffusion, and you should apply less than feels right. If you want to be noticed on arrival, you want diffusion, and you should accept that the loud phase may be short. Judge any bottle over a full day, on skin, with a fixed number of sprays, and get a second opinion before you conclude anything about projection. The full-day wear test is how you find out.

What our own catalogue shows

We cannot give you a ranked list of which fragrances we sell lean hardest on heavy base materials versus bright top materials, because nothing in a product listing records where in a composition a material sits. That is a real limitation, and it points straight at this article’s central claim: the information that would let you predict sillage from a label does not exist on the label. Base-heavy versus fresh is something you learn by wearing things, not by reading them.

Nor can we tell you how our range splits by fragrance family. About 1,226 of our descriptions use a family word — floral, woody, oriental, chypre, fougère, gourmand, aquatic, aromatic — but almost always as an adjective inside a sentence rather than as a classification, and turning that into a distribution would mean inventing a taxonomy and then pretending we had read it off a field. What can be said is that family words on a listing are written to sell rather than to classify, which is a good reason not to shop by them.

Bottles to try this on

For contrast between the two extremes, compare a close-wearing musk-led composition such as Narciso Rodriguez for Her with a strongly diffusive one such as Le Male Le Parfum. For a long base with a quiet opening, Tom Ford Oud Wood is a useful reference; for the opposite pattern of a bright, short-lived opening, Acqua di Parma Colonia is the traditional example.

Common questions

What is the difference between sillage and projection?

Projection is how far a fragrance reaches from your skin at a given moment. Sillage, from the French word for a ship’s wake, is the trail that remains in the air after you have moved through a space. A fragrance can project strongly at close range and leave little trail, or the reverse.

Can a perfume last a long time but not project?

Yes, and it is common. Longevity comes from low-volatility materials that release slowly; projection needs materials volatile enough to fill the surrounding air and detectable at very low concentrations. Those requirements pull in opposite directions, so a musk-led composition can be detectable for twelve hours and undetectable at arm’s length after one.

Why can other people smell my perfume when I cannot?

Olfactory adaptation. Repeated or prolonged exposure to an odorant produces a stimulus-specific loss of sensitivity to it that only recovers once exposure stops. Because you are wearing the fragrance continuously, you adapt while others do not. Reapplying because you cannot smell it is the usual route to overapplication.

Does eau de parfum project more than eau de toilette?

Not reliably. Raising concentration raises everything proportionally, but it cannot add diffusive materials the composition does not contain, and brands frequently reweight the blend between concentrations rather than simply diluting. Within one brand and name the EDP is usually stronger; across brands the comparison means very little.

How do I test how long a perfume lasts on me?

Apply a fixed number of sprays to skin rather than clothing, note the time, and sniff the sprayed spot at set intervals: thirty minutes, two hours, four, six, eight and twelve. Record presence rather than strength. Repeat on a second day before concluding anything, because conditions and your own sensitivity shift.

Why does the same perfume last longer on my friend?

Skin differences show up in the literature. A 2025 study reports that fragrance evaporation profiles depend on both skin properties and the fragrance molecules’ own properties, and that the pattern varies between individuals. Differences in each person’s olfactory sensitivity add a second layer of variation on top.

Does rubbing your wrists ruin a fragrance?

It shortens the opening, but not for the reason usually given. Friction between wrists does not break chemical bonds. It warms the skin, which raises vapour pressure and speeds evaporation, and spreads the liquid across more surface area, which increases the rate at which it leaves. Dab and leave it alone.

Will spraying more make a fragrance project further?

Somewhat, with diminishing returns. More material does mean higher concentration in the air, but detection works on thresholds: once you are comfortably above the threshold of the people around you, extra sprays mostly raise intensity for whoever is closest rather than extending range. A quiet fragrance is rarely fixed by volume.

Why do reviews of the same perfume disagree so much about longevity?

Because three sources of variation stack. Skin properties affect evaporation and differ between people. Olfactory sensitivity differs too: one screening of 764 people found specific anosmia to particular odour categories at rates from 3 to 47 percent. And every reviewer is adapting to the fragrance while measuring it. Disagreement is the expected result.

Does weather change how a fragrance performs?

Yes, through basic physical chemistry. Vapour pressure rises with temperature, so warm skin and warm air push material into the air faster, which tends to increase early projection and shorten duration. Moving air disperses the trail. This is why the same bottle can seem louder in July and quieter in January.

September 14, 2026

Perfume Sizes Explained: Oz to ML, and Which Size to Buy

One US fluid ounce is 29.5735 ml. That is why a 50 ml bottle is labeled 1.7 fl oz and a 100 ml bottle 3.4 fl oz: the metric figure is the real fill and the ounce figure is a rounded conversion. Compare bottles on price per millilitre, and size the bottle to how fast you will finish it.

Everything else in this article follows from those two ideas. The conversion explains the strange numbers on the box. Price per millilitre is the only comparison that survives contact with different bottle sizes, different concentrations and different discounts.

What is the exact conversion from ounces to ml?

One US fluid ounce equals 29.5735295625 millilitres, exactly. The figure is exact rather than measured because both units are defined: the US gallon is defined as 231 cubic inches, the inch is defined as exactly 2.54 centimetres, and a fluid ounce is one one-hundred-and-twenty-eighth of a gallon. NIST’s own conversion tables give the working value as 2.957353 × 10¹ millilitres.

Two cautions. The first is that the imperial fluid ounce used in the United Kingdom is a different unit, about 28.41 ml. British and American ounce figures for the same bottle will not match. The second is that this is a volume conversion, not a weight conversion; fragrance is sold by volume, and the two are not interchangeable because ethanol is lighter than water.

Why are perfume bottles sold at 30, 50 and 100 ml?

Because the industry settled on those numbers and nothing forces it to change. There is no law prescribing them.

In the European Union, mandatory pack sizes were abolished by Directive 2007/45/EC, which repealed the earlier directives that had set prescribed ranges and retained mandatory nominal quantities only for wine and spirit drinks. Cosmetics are free. In the United States, cosmetic regulation under 21 CFR Part 701 governs what the label must say, not how much liquid the bottle may hold. Nobody is required to sell 50 ml rather than 47.

What remains is convention, reinforced by tooling costs, by retail shelf design, and by the fact that consumers now read 30, 50 and 100 as the normal steps. A brand that launched at 45 ml would be read as short-changing its customers, whatever the price per millilitre said.

Why does the bottle say 1.7 oz and 3.4 oz?

Because US law requires both units, and the ounce figure is a conversion of the metric fill rather than a fill in its own right.

The Fair Packaging and Labeling Act, at 15 U.S.C. § 1453(a)(2), requires the net quantity of contents to be stated on the principal display panel “using the most appropriate units of both the customary inch/pound system of measure … and … the SI metric system.” That dual-declaration requirement took effect on 14 February 1994. NIST Handbook 130, the model regulation most states adopt, carries the same rule: from that date, “appropriate units of both systems shall be presented in a declaration of quantity,” subject to narrow exemptions.

FDA’s cosmetic rules then constrain the format. Under 21 CFR 701.13, liquid measure must be expressed in terms of the US gallon of 231 cubic inches and its quart, pint and fluid-ounce subdivisions; a declaration of less than one ounce “shall be expressed in common or decimal fractions of the respective ounce”; and decimals “shall not be carried out to more than two places.”

So a European-made 50 ml bottle has a metric fill of 50 ml, which converts to 1.6907 fl oz, which is printed as 1.7. The arithmetic below is mine and is straightforward division, but it is worth seeing laid out, because it settles most of the confusion about these labels.

Metric fill	Exact US fluid ounces (arithmetic: ml ÷ 29.5735295625)	Typically printed as	Notes
5 ml	0.1691	0.17 fl oz	Miniature and sample-vial size. In the EU, containers under 5 ml are exempt from the nominal-content declaration entirely
7.5 ml	0.2536	0.25 fl oz	Common for extrait and for dab-stopper bottles
10 ml	0.3381	0.33 or 0.34 fl oz	Both printed figures refer to the same 10 ml. Standard purse-atomiser size
15 ml	0.5072	0.5 fl oz	Rounds cleanly, which is why it reads as a half-ounce
20 ml	0.6763	0.67 or 0.7 fl oz	Often a travel-set or rollerball size
30 ml	1.0144	1 or 1.0 fl oz	30 ml is slightly more than one fluid ounce, not less
50 ml	1.6907	1.7 fl oz	The most common mid-size in fine fragrance
75 ml	2.5361	2.5 fl oz	Frequent in older and in Italian-house lines
100 ml	3.3814	3.3 or 3.4 fl oz	Both printed figures refer to the same 100 ml. 3.4 rounds up, 3.3 rounds down
125 ml	4.2268	4.2 fl oz	Less common, mostly older masculine lines
150 ml	5.0721	5 or 5.1 fl oz	Large-format, often eau de cologne
200 ml	6.7628	6.7 or 6.8 fl oz	Large-format, usually EDT or cologne
250 ml	8.4535	8.4 or 8.5 fl oz	Splash bottles and body-mist formats

The reverse direction is where people trip. A label reading 3.4 fl oz does not mean 100.55 ml, even though 3.4 × 29.5735 = 100.55 by arithmetic. It means 100 ml, rounded up for the ounce declaration. The metric number is the specification; the ounce number is derived from it.

Printed ounce figure	Literal ml if taken at face value (arithmetic: fl oz × 29.5735295625)	Actual fill almost always
0.17 fl oz	5.03 ml	5 ml
0.25 fl oz	7.39 ml	7.5 ml
0.34 fl oz	10.06 ml	10 ml
1 fl oz	29.57 ml	30 ml
1.7 fl oz	50.28 ml	50 ml
2.5 fl oz	73.93 ml	75 ml
3.4 fl oz	100.55 ml	100 ml
6.8 fl oz	201.10 ml	200 ml

Before any of the conversions, one fact about how sizes are actually labelled. Of the 3,832 bottles we list, about 3,809 — some 96% — state their size only in fluid ounces. Every millilitre figure in this article, and on most of our own listings, is a conversion of an ounce label rather than a measured volume: 3.4 oz becomes 100 ml because that is the nominal bottle, not because anyone put a graduated cylinder to it.

The sizes themselves cluster hard. About 1,885 listings are 100 ml (3.4 oz), 379 are 50 ml (1.7 oz), 334 are 125 ml (4.2 oz), 210 are 75 ml (2.5 oz), 173 are 30 ml (1 oz), 160 are 90 ml (3 oz) and 149 are 200 ml (6.8 oz), with 38 distinct sizes in all and a long thin tail down to 5 ml. Roughly 98 listings give no size we can read at all. So the size ladder is not a ladder: it is one dominant rung, a few real alternatives, and a scattering of oddities.

Why is price per millilitre the only honest comparison?

Because a sticker price compares two things at once — how much liquid you get and how much each unit of it costs — and hides both.

Price per millilitre is simple division: price divided by millilitres. It is the one number that lets you compare a 30 ml at one price against a 100 ml at another, a discounted EDT against a full-price EDP, and a boxed unit against a tester of the same fragrance. Nothing else does that.

No US federal law requires a seller to show it. NIST’s guide to US retail pricing laws states that unit pricing is mandatory in ten jurisdictions — Connecticut, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Oregon, Rhode Island, Vermont and the District of Columbia — with voluntary provisions in nine more and no provisions at all in thirty-three states. Coverage also varies by product category. In practice, for fragrance, the arithmetic is yours to do.

The figures in the table below are illustrative arithmetic, not prices from this or any catalogue. They exist to show the shape of the problem.

Illustrative size and price	Price per ml (arithmetic)	Price per fl oz (arithmetic)	What it shows
30 ml at $60	$2.00	$59.15	The small bottle is usually the worst value per millilitre
50 ml at $85	$1.70	$50.28	The middle size normally sits between the other two
100 ml at $120	$1.20	$35.49	The standard case for buying large
200 ml at $190	$0.95	$28.09	Large formats can be dramatically cheaper per millilitre
50 ml at $62 versus 100 ml at $140	$1.24 versus $1.40	$36.67 versus $41.40	The counterexample. When one size is discounted and the other is not, the big bottle can be the worse buy

Two conversions worth memorising. To turn a price per ounce into a price per millilitre, divide by 29.5735. To turn a price per millilitre into a price per ounce, multiply by 29.5735.

The per-millilitre penalty for buying small is steep and consistent. Across the roughly 3,820 of our listings with a readable size, the median works out to about $1.84 per ml at 30 ml (1 oz), $1.39 at 50 ml (1.7 oz), $0.60 at 100 ml (3.4 oz) and $0.30 at 200 ml (6.8 oz). A 30 ml costs roughly three times as much per millilitre as a 100 ml of the same liquid. And the exception is rare: among the 385 fragrances we stock in more than one size, the largest bottle fails to be the cheapest per millilitre in only about 5.5% of cases. Buying big is almost always cheaper per spray, which is an argument for buying big only if you are going to finish it.

What are travel sizes, miniatures and atomisers?

Four different things get called travel sizes, and they are not equivalent.

Format	Typical volume	What it is	What to watch
Manufacturer travel spray	10–20 ml	A factory-filled spray of the same liquid, often sold in a refillable metal case	Usually the highest price per millilitre in the range
Miniature	4–7.5 ml	A small factory-filled bottle, historically a gift-set or counter item	Some vintage miniatures are dab-only with no atomiser
Sample vial	1–2 ml	A factory-filled vial, usually a promotional item rather than a stocked product	Very short usable life once opened, because of the large air-to-liquid ratio
Refillable atomiser	5–10 ml	An empty container you fill yourself from a bottle you own	Decanting introduces air and handling. Fill, cap and use it within weeks rather than months

Two points matter for anyone flying. The TSA liquids rule limits carry-on containers to 3.4 ounces (100 ml) or less per item, all fitting in one quart-sized bag per passenger. A 100 ml bottle is therefore exactly at the carry-on ceiling, and a 125 ml or 200 ml bottle is not permitted in the cabin at all. And in the European Union, containers of less than five millilitres are exempt from the nominal-content declaration under Article 19(1)(b) of Regulation 1223/2009, which is why very small vials often carry no volume marking.

One distinction is worth holding on to here: a travel size is not a decant. A travel size is a small bottle the manufacturer filled, sealed and sold as a small bottle, with the brand’s own atomiser on it. A decant is liquid somebody else transferred into a third-party sprayer, which means the volume, the pump and the chain of custody are all outside the brand’s control. The listing title is where the format is stated, so read it rather than inferring it from the price. The same logic applies to tester units, which are full-size bottles in plain cartons rather than a different product.

How do you choose a bottle size?

Estimate how long a bottle lasts you, not how long it lasts in theory. Count your sprays per wearing and how many days a week you wear that fragrance. A bottle you finish in eight months and a bottle you finish in eight years are different purchases. The spray-count arithmetic turns that into a number of months.
Buy small on a fragrance you have not worn for a full day. The 30 ml costs more per millilitre, and that premium is cheaper than a 100 ml you stop reaching for. A proper wear test comes first.
Buy large only on a fragrance you have finished a bottle of before. Repeat purchase is the only evidence that survives.
Compute price per millilitre for every option before deciding. Divide price by millilitres. Do it for the 30, the 50 and the 100, including any discount, and write the three numbers down.
Check whether the discount is on the size you actually want. A promotion on one size regularly inverts the usual ordering, which is the single most common way buyers overpay.
Cross-check the concentration you are comparing. A 100 ml EDT and a 50 ml EDP are different products, not two sizes of one product, and price per millilitre does not make them comparable. See what the concentration labels mean.
Prefer 100 ml or smaller if the bottle will travel with you. That is the TSA carry-on ceiling and it is not negotiable at the checkpoint.
Factor in how long you will take to use it. A very large bottle of something you wear occasionally spends years partly full and partly air, which is the condition that ages a fragrance fastest. Where the bottle lives matters more the longer you keep it.

Which perfume size myths are wrong?

Myth: one ounce is thirty millilitres

The claim: 1 fl oz = 30 ml.
What the evidence shows: one US fluid ounce is 29.5735295625 ml. A 30 ml bottle holds 1.0144 fl oz — slightly more than an ounce, not less.
What people wrongly conclude: that a bottle labeled “1 fl oz” and a bottle labeled “30 ml” are different sizes. They are the same bottle described two ways.

Myth: 3.3 oz and 3.4 oz are different bottles

The claim: a 3.3 oz bottle is smaller than a 3.4 oz bottle.
What the evidence shows: 100 ml is 3.3814 fl oz. Brands round it either way, and FDA’s format rule permits decimals to two places. Both labels describe 100 ml.
What people wrongly conclude: that a listing showing 3.3 oz is a smaller or counterfeit version. Check the metric figure, which is the specification.

Myth: the ounce figure is the real fill

The claim: the bottle contains exactly the printed number of ounces.
What the evidence shows: for fragrance made to a metric fill, the metric number is the specification and the ounce number is its rounded conversion, printed because 15 U.S.C. § 1453(a)(2) requires both systems.
What people wrongly conclude: that 3.4 fl oz means 100.55 ml and that a bottle measuring 100 ml is underfilled.

Myth: the biggest bottle is always the best value

The claim: price per millilitre always falls as size rises.
What the evidence shows: it usually does, at list price. Discounting breaks it routinely, and a promoted 50 ml can undercut a full-price 100 ml per millilitre.
What people wrongly conclude: that the arithmetic can be skipped. It cannot; it takes ten seconds.

Myth: travel sprays are a weaker version

The claim: smaller formats are diluted.
What the evidence shows: a manufacturer travel spray of a given fragrance at a given concentration is the same liquid as the full-size bottle. What differs is the container and, almost always, the price per millilitre.
What people wrongly conclude: that weaker performance from a travel spray indicates a different formula, when the usual cause is a smaller or differently engineered atomiser.

Myth: shelf labels are required to show price per ml

The claim: unit pricing is the law.
What the evidence shows: there is no federal unit-pricing requirement in the United States. Ten jurisdictions mandate it, nine treat it as voluntary, and thirty-three states have no provision at all — with coverage varying by product category even where it applies.
What people wrongly conclude: that a displayed unit price is guaranteed present, standardised and comparable between retailers.

The honest limits of this article

The conversion arithmetic here is exact and checkable, and you should check it. What is not exact is the fill in any individual bottle. Filling lines work to tolerances, and the European framework for prepacked goods sets those tolerances explicitly: under the average-quantity system, the mean contents of a batch must not fall below the nominal quantity, only a small proportion of packages may fall below the nominal quantity minus the tolerable negative error, and none marked with the estimated sign may fall below twice that error. For nominal quantities between 100 and 200 ml, the tolerable negative error is 4.5 percent. A 100 ml bottle is therefore a bottle nominally holding 100 ml, not a guarantee of exactly 100.000 ml. Rounding conventions also differ between brands and between regions, so the same fill can appear as 3.3 or 3.4 fl oz on different packages. We have not measured any bottle, and the illustrative price arithmetic above uses invented figures chosen to make the comparison legible, not prices from this catalogue.

Practical shortcuts

For everyday use, three rounded facts cover almost everything: 30 ml is about one ounce, 50 ml is about 1.7 ounces, and 100 ml is about 3.4 ounces and is the largest bottle you can carry onto a US flight. For anything involving money, use the full 29.5735 and divide.

What our own catalogue shows

Put that the other way round. For the 385 fragrances we stock in more than one size, the smallest bottle costs a median of about 95% more per millilitre than the largest — roughly double. We are quoting the median deliberately, and only the median: individual pairs run from a small discount on the little bottle to absurd multiples, because 5 ml miniatures sit in the same pool as 200 ml flacons and wreck any average built from them. The median is the figure that describes a typical pair of bottles on a shelf.

Bottles to try this on

Size laddering is easiest to see on a fragrance stocked across a full range: Versace Eros next to the 1 oz (30 ml) Versace Eros is the arithmetic in two bottles. the 200 ml Paco Rabanne 1 Million makes the same point at the other end of the scale, and a large-format eau de cologne such as Acqua di Parma Colonia at 180 ml is where the per-millilitre advantage of the big bottle is largest of all. For a carry-on-legal option, the 1.6 oz (50 ml) YSL Libre sits comfortably inside the TSA limit.

Common questions

How many ml is 1 oz of perfume?

One US fluid ounce is 29.5735295625 ml. Bottles sold as 1 fl oz are usually filled to 30 ml, which is 1.0144 fl oz, so the round 30 is slightly more than a true ounce. The UK imperial fluid ounce is a different unit at roughly 28.41 ml and will not match American figures.

Is 3.4 oz the same as 100 ml?

Yes. 100 ml converts to 3.3814 US fluid ounces, and brands print that as either 3.3 or 3.4. Both labels describe the same 100 ml fill. FDA’s format rule allows decimal fractions to two places, so the rounding direction is a brand choice rather than a difference in what is in the bottle.

Why do perfume bottles show two different measurements?

US law requires it. The Fair Packaging and Labeling Act, at 15 U.S.C. 1453(a)(2), requires net quantity to be declared on the principal display panel in both customary inch-pound units and SI metric units, a rule that took effect on 14 February 1994. NIST Handbook 130, adopted by most states, carries the same requirement.

What size perfume can I take on a plane?

In carry-on baggage, the TSA limits containers to 3.4 ounces (100 ml) or less, all fitting inside one quart-sized bag per passenger. A 100 ml bottle is exactly at the limit. A 125 ml or 200 ml bottle cannot go in the cabin regardless of how much liquid is left inside it.

Is the 100 ml bottle always cheaper per ml than the 50 ml?

At list price, usually yes. Discounting breaks the pattern often enough to check every time. Divide price by millilitres for each size, including any promotion, and compare the three numbers. A promoted 50 ml can undercut a full-price 100 ml on price per millilitre by a clear margin.

How do I calculate price per ml?

Divide the price by the number of millilitres. A 100 ml bottle at $120 is $1.20 per ml, using arithmetic on illustrative figures. To convert a price per ounce into a price per millilitre, divide by 29.5735. To go the other way, multiply by 29.5735. No US federal law requires a seller to display this for you.

Why are perfumes sold in 30, 50 and 100 ml?

Convention, not regulation. The EU abolished mandatory pack sizes with Directive 2007/45/EC, keeping them only for wine and spirits, and US cosmetic rules in 21 CFR Part 701 govern labelling rather than fill volumes. The sizes persist because of tooling, shelf design and consumer expectation.

Should I buy a big bottle of a perfume I have never worn?

No. Buy the smallest format available until you have worn it through a full day and a second wearing. The per-millilitre premium on a 30 ml is small compared with the cost of a 100 ml bottle you stop reaching for. Repeat purchase is the only reliable signal that a large bottle is right.

Does a bigger bottle mean the perfume goes off before I finish it?

It raises the risk, because a bottle you use slowly spends years partly full, and the headspace of air above the liquid is where oxidation happens. Size the bottle to your actual rate of use rather than to the best price per millilitre, particularly for a fragrance you wear only occasionally.

Do perfume bottles contain exactly the stated volume?

They contain the nominal volume within permitted tolerances. Under the European average-quantity system, batch mean contents must not fall below the nominal quantity, and for nominal quantities between 100 and 200 ml the tolerable negative error is 4.5 percent. A 100 ml bottle is a bottle nominally holding 100 ml, not a guarantee of exactly 100.000 ml.

September 14, 2026

Perfume Concentration Chart: Parfum, EDP, EDT, EDC and Oil

Perfume concentration describes how much fragrance compound is dissolved in the alcohol base. Parfum is the strongest, then eau de parfum, then eau de toilette, then eau de cologne. No regulator defines these terms or their percentages. The familiar figures – parfum 20 to 30 percent, EDP 15 to 20 – are industry convention, and each brand sets its own.

That last point changes how you should read every chart you have seen, including the one below.

What does perfume concentration actually measure?

A finished fine fragrance is mostly solvent. The scented part is a single blended material that perfumers call the compound, the concentrate, or the juice: dozens to hundreds of individual aroma materials, a few natural extracts, most of them synthetic. That compound is dissolved in ethanol, usually with some water and a few functional additives such as UV filters.

Concentration is the proportion of that compound in the finished liquid, by weight. An 18 percent eau de parfum is 18 parts compound to 82 parts everything else.

Two consequences follow, and both are routinely missed. First, concentration says nothing about what is in the compound. Two bottles at an identical 18 percent can hold entirely different materials with entirely different volatilities and detection thresholds. It measures quantity, not character or staying power.

Second, the alcohol in a US fine fragrance is denatured. Under 27 CFR Part 21, the Alcohol and Tobacco Tax and Trade Bureau authorises specific specially denatured alcohol formulas — 38-B, 39-B, 39-C and 40 among them — for the use codes “121. Perfumes and perfume tinctures” and “122. Toilet waters and colognes.” The only division US federal alcohol regulation draws here is a two-way split between perfumes and toilet waters, and it attaches no percentage to either.

Do parfum, EDP and EDT have legal definitions?

No. Not in the United States, not in the European Union, and not in any standard published by the industry’s own trade bodies. This is the most important fact in the subject, so here is the evidence rather than the assertion.

What US law requires

Cosmetic labelling in the United States is governed by 21 CFR Part 701 and the Fair Packaging and Labeling Act. Those rules require a statement of identity, a net quantity of contents declaration, an ingredient declaration in descending order of predominance, and the name and place of business of the manufacturer, packer or distributor. Fragrance may be declared generically as “fragrance.” Nothing in Part 701 defines eau de parfum, eau de toilette or cologne, and nothing requires a concentration figure anywhere on the package.

What EU law requires

Regulation (EC) No 1223/2009, Article 19(1), lists the required labelling particulars: responsible person, nominal content by weight or volume, date of minimum durability, precautions, batch number, product function, and the ingredient list. Article 19(1)(g) then says that “Perfume and aromatic compositions and their raw materials shall be referred to by the terms ‘parfum’ or ‘aroma’.” The word parfum in an EU ingredient list is the name of the whole fragrance mixture as an ingredient. It is not a concentration class, and the Regulation defines none anywhere.

What the industry’s own guidance says

Cosmetics Europe, the European industry’s trade association, published labelling guidelines that treat these words as vocabulary rather than specification. The guidance notes only that “some terms used on labels are internationally accepted (e.g. ‘eyeliner’, eau de toilette, etc.).” Internationally accepted is not the same as defined.

The International Fragrance Association is more revealing still. IFRA Standards restrict individual materials, not overall concentration: those that impose a quantitative limit “are expressed as a Maximum Acceptable Concentration (MAC) of fragrance ingredients in the finished consumer product, not in the fragrance mixture.” IFRA also sorts products into exposure categories, and in the current 51st Amendment guidance Category 4 is headed “Products related to fine fragrance,” with the exposure driver given as “Fine fragrance (eau de toilette, parfum etc.)” — one category, covering both. The earlier 49th Amendment categorisation was blunter still, listing “Hydroalcoholic and non-hydroalcoholic fine fragrance of all types (Eau de Toilette, Parfum, Cologne, solid perfume, fragrancing cream, aftershaves of all types, etc.)” as a single entry. The body that writes the industry’s safety limits does not treat EDT and parfum as different classes of product.

So where do the percentage charts come from?

From custom, repeated until it hardened. The ranges circulate widely and are attributed to no one.

The closest traceable published figures sit in the safety-assessment literature. Cadby, Troy and Vey’s 2002 paper on consumer exposure to fragrance ingredients, in Regulatory Toxicology and Pharmacology, gives typical fragrance levels by product type from COLIPA and RIFM data. It lists two relevant entries: perfume extracts at 20 percent, toilet waters at 8 percent. Two categories, not five.

The engineering literature does not supply the missing table either. The 2021 review “Perfume and Flavor Engineering: A Chemical Engineering Perspective” in Molecules covers composition, evaporation and performance modelling in detail and contains no table of EDT or EDP concentration ranges. Neither does Perfume Engineering: Design, Performance and Classification, by the same group. Those numbers are absent because they are not technical facts.

Perfume concentration chart

Below are the conventional ranges as they are usually quoted, alongside what is actually established. Read the fourth column before the third.

Term on the bottle	Also sold as	Conventionally quoted compound range (convention only — not regulated, not verifiable from the label)	Regulatory status	What the term reliably tells you
Parfum / Extrait de Parfum / Pure Perfume	Extrait, Perfume Extract	15–40%, most often quoted as 20–30% (convention)	Undefined. “Perfumes and perfume tinctures” is a US denatured-alcohol use code with no percentage attached	The brand positions this as its most concentrated version, usually its most expensive per millilitre, and often sold in smaller bottles or with a dab stopper
Eau de Parfum (EDP)	Parfum de Toilette, Eau de Parfum Intense	10–20%, most often quoted as 15–20% (convention)	Undefined in 21 CFR 701, in Regulation 1223/2009, and in IFRA Standards	More compound than the same brand’s EDT of the same name, in almost all cases. Nothing across brands
Eau de Toilette (EDT)	Toilet water	5–15%, most often quoted as 5–15% (convention)	Undefined. “Toilet waters and colognes” is a US denatured-alcohol use code. Cosmetics Europe calls the term “internationally accepted,” not defined	Less compound than the same brand’s EDP of the same name. The published safety-assessment figure for toilet waters is 8%
Eau de Cologne (EDC)	Cologne (European sense), Kölnisch Wasser	2–5% (convention)	Undefined	A light, usually citrus-and-herb style, traditionally sold in large splash bottles. In US retail speech, “cologne” often just means a men’s fragrance at any strength
Eau Fraîche / Eau de Cologne Légère / Eau Vive	Body mist, fragrance mist, splash	1–3% (convention)	Undefined	The lightest thing a brand sells under that name. Often more water in the base
Elixir / Intense / Extrême / Absolu / Le Parfum	Flanker naming of all kinds	No convention exists (marketing term)	Undefined, and not even conventionally ranked	Nothing about concentration. Usually signals a reworked composition, which may or may not be more concentrated
Perfume oil / Attar / Oil-based	Roll-on oil, non-alcoholic perfume	Not comparable — the solvent is a carrier oil or a dilutant, not ethanol	Undefined	That it contains little or no alcohol. Loading varies enormously and is not inferable from the category

Before any chart, see how lopsided the real market is. Across the 3,832 bottles we currently stock, eau de parfum and eau de toilette together account for close to four fifths of everything. Eau de cologne accounts for about 276, parfum or extrait for about 171, oils and attars around 26, and three listings say eau fraîche. Another 286, roughly 7%, carry no concentration word at all. Two rungs carry nearly all the traffic, and a real minority of bottles do not say which rung they are on. These are counts parsed from listing titles, not a concentration field.

What figures can actually be sourced?

A short table, because the honest list is short. Every figure in it comes from Cadby, Troy & Vey (2002) in Regulatory Toxicology and Pharmacology, citing COLIPA (1987) and RIFM (1996): exposure-assessment estimates used for safety modelling, not product definitions.

Figure	Value	Status
Typical fragrance level, perfume extracts	20%	Safety-modelling estimate
Typical fragrance level, toilet waters	8%	Safety-modelling estimate
Typical fragrance level, body lotion	0.4%	Included for scale: a fine fragrance carries roughly 20 to 50 times the fragrance load of a scented lotion
Fragrance delivered per unit area, toilet waters and extracts	about 300 µg/cm²	The highest of any product category in that dataset
Concentration range for any named commercial fragrance	Not published	Brands do not disclose compound percentage, and no regulation requires them to

How does concentration relate to longevity and projection?

It contributes to both, and it determines neither.

The usable physical model comes from perfume engineering, where the perceived intensity of a material is its odour value: its concentration in the air divided by its odour detection threshold. Gas-phase concentration depends on how much is in the liquid, its vapour pressure, and how it interacts with everything else. Intensity therefore rises with amount, rises with volatility, and falls with the threshold at which a nose can detect it.

That structure explains why concentration alone is a weak predictor. Raising the compound loading raises every term proportionally, so a more concentrated version of the same compound will, all else equal, smell stronger and last somewhat longer. But detection thresholds differ between materials by orders of magnitude, not percentages: published compilations report vanillin as low as 0.00000016 ppm against ammonia from 0.043 ppm and benzene from 0.47 ppm. A material detectable at a millionth of another’s concentration contributes out of all proportion to its weight.

Property	What it depends on most	How much concentration affects it
Opening strength (impact)	The most volatile materials and their thresholds	Moderate. More compound means a bigger opening, but the opening is dominated by which top materials were chosen
Projection at distance (diffusion)	Volatility combined with very low detection thresholds. Highly diffusive materials are a formulation choice	Moderate. Concentration scales what is there; it does not add diffusive materials that are not there
Longevity on skin (tenacity)	The proportion of low-volatility materials — the base — and how well they hold onto skin	Indirect. A 25% compound that is mostly citrus will fade faster than a 10% compound loaded with musks and woods
How the scent changes over hours (development)	The spread of volatilities within the compound	Little. The same compound at two concentrations follows broadly the same arc
Skin-to-skin variation	Individual skin properties and individual olfactory sensitivity	None. Concentration does not reduce variation between people

The four performance words used inside the industry separate what consumer vocabulary runs together: impact is the immediate sensation, tenacity is persistence near the source, diffusion is how well the scent works at a distance, and volume is effectiveness across both time and distance. Concentration is one input to all four and the controlling input to none. Those are the trade names for what consumers call sillage, projection and longevity.

Why can an EDT of one fragrance outlast an EDP of another?

Because the two variables that matter most are independent of concentration.

The first is composition. Longevity is a property of the least volatile materials in the blend: a compound built on sandalwood, synthetic musks and amber materials keeps producing detectable vapour long after one built on bergamot, lemon and light florals has gone. Published descriptions put top materials at 15 to 30 minutes on skin, heart materials at 3 to 4 hours, base materials beyond 4 hours. The arithmetic, illustrative only: a 10 percent compound that is 40 percent base materials carries 4 percent base material in the bottle, while a 20 percent compound that is 10 percent base materials carries 2 percent. The weaker-sounding bottle has twice the material that determines hour eight.

The second is the version, not the class. When a brand makes an EDP and an EDT of the same name, the two are frequently not one compound diluted differently. Brands reweight the blend — often making the EDT fresher and more citrus-forward, the EDP warmer and more resinous — because simply diluting a warm composition gives a thin, unbalanced result. Once the compounds differ, the concentration ratio tells you very little.

Where does perfume oil fit on the chart?

Awkwardly, which is why most charts handle it badly.

An alcohol-based fragrance releases scent in two phases: the ethanol flashes off in the first minutes, carrying a burst of the more volatile materials with it, then the remaining materials evaporate from the skin at their own rates. An oil-based fragrance has no ethanol and so no burst. The compound sits in a carrier — fractionated coconut oil, jojoba, or a synthetic dilutant — and releases slowly from the start.

The practical consequences are consistent. Oils read quieter at arm’s length, sit closer to the skin, and often stay detectable to the wearer longer, because they are held on the skin rather than lost to the air. Percentages quoted for oils are not comparable to those for sprays: comparing “30 percent oil” to “30 percent extrait” is a category error. Oils suit skin sensitivity, and are the wrong tool if you want a fragrance that carries across a room.

How do you read a bottle when the label will not tell you the percentage?

You cannot extract the number. You can extract most of what it would have told you. Work in this order.

Read the concentration word only as a within-brand ranking. If a house sells both an EDT and an EDP of one name, the EDP almost certainly carries more compound. Across two different houses, the words are not comparable and should not be compared.
Ignore Elixir, Intense, Extrême, Absolu and Le Parfum as concentration signals. These are flanker names. They indicate a different composition, not a measured step up.
Look at the note list for base-heavy material families. Oud, labdanum, benzoin, tonka, vanilla, patchouli, sandalwood, cashmeran, ambroxan and musks are low-volatility, and a list dominated by them predicts long wear better than the concentration word does. Citrus, aldehydes, mint and light green notes predict the opposite. Reading the base tier is the more useful skill.
Check where fragrance sits in the ingredient list. On EU-compliant packaging ingredients run in descending order of weight, with anything under 1 percent in any order. A fine fragrance typically shows alcohol first and parfum second, water after. Whether parfum precedes or follows water is a hint about loading, never a measurement.
Count the individually named fragrance allergens. EU rules require named disclosure of specified allergenic fragrance materials above 0.001 percent in leave-on products. A long allergen list is real disclosure rather than marketing copy, though it is not a concentration reading.
Compare price per millilitre, not price. The step from EDT to EDP usually costs more per millilitre, and whether that is worth it depends on which version you prefer.
Decide on wear, not on the chart. Judge the actual bottle over a full day on your own skin. There is a way to do that without wasting money.

Which concentration myths are wrong, and what do people wrongly conclude?

Myth: EDP is defined as 15 to 20 percent oil

The claim: a fixed percentage band defines each category.
What the evidence shows: no percentage appears in 21 CFR Part 701, Regulation (EC) No 1223/2009, IFRA Standards or Cosmetics Europe’s labelling guidance. The only traceable published figures are exposure-assessment estimates — 20 percent for extracts, 8 percent for toilet waters — which exist to model skin exposure, not to define a product.
What people wrongly conclude: that an EDP from one brand and an EDP from another carry comparable strength, and that a bottle can be judged before wearing it.

Myth: higher concentration always means longer wear

The claim: concentration ranks longevity.
What the evidence shows: longevity is governed by the low-volatility fraction. Base materials persist beyond 4 hours on skin while top materials are largely gone in 15 to 30 minutes, and a concentration figure does not reveal that split.
What people wrongly conclude: that a disappointing EDP was a fake or a bad batch, when it was a fresh composition doing what fresh compositions do.

Myth: the percentage is printed on the box if you know where to look

The claim: a code or figure somewhere discloses compound loading.
What the evidence shows: US and EU rules require net contents, ingredients, identity, batch marking and responsible-party details. None require or provide compound percentage, and a batch code identifies a production run, not a formula strength.
What people wrongly conclude: that a seller is withholding information the seller does not have.

Myth: Elixir and Intense are formal steps above EDP

The claim: there is an established ladder of EDT, EDP, Intense, Elixir, Extrait.
What the evidence shows: no authority ranks these, and no convention covers them either.
What people wrongly conclude: that paying more for an Elixir buys a measurable increase in concentration. It buys a different product.

Myth: reformulation is always a concentration cut

The claim: when a fragrance smells weaker than it used to, the brand diluted it.
What the evidence shows: material availability changes for regulatory reasons independent of concentration. Butylphenyl methylpropional, long used in lily-of-the-valley and clean-laundry accords, was added to the EU’s prohibited list as entry 1666 of Annex II and has been banned in EU cosmetics since 1 March 2022. Removing a material and rebalancing around it changes performance without changing the concentration word on the box.
What people wrongly conclude: that the concentration label was a lie, rather than that the compound behind it changed.

Myth: alcohol content is filler that cheapens the product

The claim: you are paying for alcohol.
What the evidence shows: ethanol is a functional solvent. It dissolves materials that will not otherwise mix, it delivers the opening burst as it flashes off, and its use in US perfumery is authorised in denatured form under 27 CFR Part 21.
What people wrongly conclude: that oils are strictly superior. They are different, and quieter at distance.

The honest limits of this article

No retailer, reviewer or consumer can verify a fragrance’s compound percentage: it needs analytical work on the finished liquid against a reference, and brands treat the compound as a trade secret. Everything in the conventional chart is therefore convention rather than fact, and the two figures carrying a citation — 20 percent for extracts, 8 percent for toilet waters — are exposure-modelling estimates from the 1980s and 1990s, not measurements of any current product. The note-tier timings are general descriptions from the engineering literature, not guarantees for any bottle: a 2025 study reports that evaporation profiles depend on skin properties as well as on the molecules. Treat concentration as one weak signal among several, and weight your own wear test above it.

Buying by concentration without overpaying for the word

If you already know a fragrance and want it to last longer, buying the EDP of that exact name is reasonable, because within one house the ranking usually holds. If you are buying blind, the concentration word is one of the least informative things on the box and price per millilitre one of the most. Sealed retail, tester and unboxed units of the same fragrance at the same concentration are the same liquid: the packaging changes, the strength does not.

What our own catalogue shows

Here is the price question answered properly, because the obvious answer misleads. Across our whole catalogue the median eau de parfum works out to about $0.88 per ml and the median eau de toilette about $0.59 — a gap of roughly 49%. That figure is near-useless for a buying decision: the two shelves hold different fragrances from different brands at different price levels, so it mostly tells you that expensive brands favour eau de parfum. The like-for-like comparison answers the actual question. Across the 73 fragrances we stock in both concentrations, the eau de parfum costs a median of about 13% more per millilitre than the eau de toilette of the same name. Thirteen percent, not fifty.

Full concentration ladders are rarer than the marketing implies. Only five fragrances in our catalogue are stocked in three or more concentrations under one name: Versace Eros, Armaf Club de Nuit, Dior Homme, Azzaro Most Wanted and Worth Je Reviens. For nearly everything else the choice is one concentration in two or three sizes.

Bottles to try this on

Within-brand laddering is clearest when you can put two bottles side by side: Dior Sauvage Eau de Toilette against Dior Sauvage Eau de Parfum, and, if you can get both in front of you, Bleu de Chanel Eau de Toilette against Bleu de Chanel Parfum. For a light concentration that outperforms its category, Acqua di Parma Colonia is the traditional reference. For an alcohol-free comparison, an oil such as an Ajmal oud oil roll-on behaves differently from any spray here.

Common questions

Is eau de parfum legally required to be stronger than eau de toilette?

No. Neither US cosmetic labelling rules in 21 CFR Part 701 nor EU Regulation 1223/2009 define these terms or set any percentage. Within a single brand the EDP of a given name is almost always more concentrated than the EDT of the same name, because that is how brands position them. Across brands, no comparison is reliable.

What percentage of oil is in eau de parfum?

Nobody outside the brand knows, and the brand does not publish it. Charts quoting 15 to 20 percent are repeating a convention with no regulatory basis. The only traceable published figures for this product class come from safety-exposure literature, which uses 20 percent for perfume extracts and 8 percent for toilet waters and stops there.

Does parfum last longer than eau de parfum?

Usually within the same brand and name, because it typically carries more compound. Not across different fragrances. Longevity is set by how much low-volatility material a blend contains, and a citrus-led extrait can fade faster than a musk-led eau de toilette. Judge the specific bottle, not the category word.

What does Elixir or Intense mean on a perfume bottle?

It means the brand released a variant. There is no convention, let alone a regulation, placing Elixir, Intense, Extreme, Absolu or Le Parfum at a defined concentration. These names usually signal a reworked composition, often warmer or sweeter than the original, which may or may not carry more compound than the standard eau de parfum.

Why does my eau de parfum fade faster than a friend’s eau de toilette?

Two reasons. The compositions differ: yours may be built on volatile citrus and light florals, theirs on musks and woods that keep releasing for hours. And skin differs: a 2025 study reports that evaporation profiles depend on both skin properties and the fragrance molecules themselves, so how quickly materials leave varies between individuals.

Is perfume oil stronger than eau de parfum?

It is not comparable. Oils have no ethanol, so there is no initial burst and less material lost to the air. They usually sit closer to the skin, project less at a distance, and stay detectable to the wearer longer. Percentages quoted for oils and for alcohol sprays measure different things and should not be compared.

Can I tell a perfume’s concentration from the ingredient list?

Only loosely. EU-compliant lists run in descending order of weight, with anything below 1 percent in any order, and fragrance appears as a single ingredient called parfum or fragrance. Seeing parfum listed before water hints at a heavier load. It is a hint, not a measurement, and it cannot be converted to a percentage.

Does eau de cologne mean a men’s fragrance?

Not in the original sense. Eau de cologne describes a light, traditionally citrus-and-herb style sold in large splash bottles, conventionally the weakest of the alcohol-based categories. In American retail speech, cologne drifted into meaning any men’s fragrance regardless of concentration, which is why the same word now carries two meanings.

Should I buy the EDT or the EDP version of a fragrance I like?

Wear both before deciding, because brands often reweight rather than simply dilute: the EDT may be fresher and the EDP warmer, so they are not always the same scent at two volumes. If you prefer the EDP and want longer wear, buy it. If you prefer the EDT, extra concentration of a scent you like less is not an upgrade.

Do stronger concentrations irritate skin more?

More compound on skin means more of every material in it, so a heavier concentration raises exposure. IFRA Standards control this by limiting individual materials as a share of the finished product rather than capping overall concentration, and EU rules require named disclosure of specific fragrance allergens above 0.001 percent in leave-on products. If you react to a fragrance, check that list.

September 14, 2026

Flankers, Reformulations and Vintage Explained

A flanker is a new fragrance released under an existing fragrance’s name: Sauvage Elixir, Bleu de Chanel Parfum, MYSLF Le Parfum. It shares the brand equity, not necessarily the formula. Intense, Elixir, Absolu and Le Parfum are marketing terms with no legal definition, so read the full product name and concentration together.

Once you can read a fragrance’s family tree, a confusing shelf becomes legible. You stop asking which Sauvage is the real one and start asking which branch you actually want.

What is a flanker, exactly?

A flanker is a fragrance launched under the name of an established one. It can be almost anything: a higher concentration of the same formula, a different formula sharing a theme, a seasonal edition, a gender counterpart, or a wholly new composition carrying an old name.

There is no official taxonomy, no regulator and no industry standard. “Flanker” is trade slang. That is why the same word covers Bleu de Chanel Parfum, which is a genuine extension of one idea by the same family of perfumers, and releases that share nothing with the original but the logo.

The useful distinction is between three types:

Concentration flankers. The same broad idea reworked at a higher or lower strength. The name usually signals this: Eau de Toilette, then Eau de Parfum, then Parfum.
Interpretation flankers. A different composition on the same theme, often with a qualifier such as Intense, Noir, Absolu or a material name such as Santal or Oud.
Franchise flankers. A new fragrance sharing only the name and the marketing, sometimes with a different perfumer and a different fragrance family.

Why do brands make so many of them?

Because a flanker inherits something a new name has to buy. It inherits shelf space, search traffic, a customer who already knows the bottle, and a sales history that retail buyers will underwrite. A new pillar fragrance has to create demand; a flanker converts existing demand.

It also spreads risk. Fragrance launch economics are unforgiving, and licence agreements often oblige a licensee to spend a contractual minimum on advertising, which one public licensee reported at 15.2% of net sales in early 2025. A flanker rides on advertising that has already been paid for.

The pace is visible in the record. Yves Saint Laurent’s MYSLF began as an Eau de Parfum and has since been joined by MYSLF Le Parfum, MYSLF L’Absolu and an MYSLF Eau de Toilette Intense — four named versions inside a few years. Yves Saint Laurent does not publish a launch-date archive and the individual years circulate only in listing databases, so they are not given here. What is documented is the outcome: MYSLF Absolu won Fragrance of the Year for Men’s and Universal Luxury at the 2026 Fragrance Foundation Awards, credited to L’Oréal, Givaudan and perfumers Daniela Andrier, Antoine Maisondieu and Christophe Raynaud.

None of that is a criticism. Some flankers are better than their originals. It does mean that a brand’s fragrance count grows far faster than its ideas do.

What do Intense, Extreme, Elixir, Absolu, Le Parfum and Eau Fraîche actually mean?

Less than you would hope. The three terms with any conventional meaning are Eau de Toilette, Eau de Parfum and Parfum or Extrait, which broadly signal increasing concentration of fragrance oil. Everything else is a name.

Suffix on the bottle	What it usually signals	What it does not guarantee
Eau de Toilette	A lower concentration, often the original release of a men’s line	That it is weaker in effect; some EDTs project harder than their EDPs
Eau de Parfum	A higher concentration than the EDT of the same name	The same formula at greater strength; it is frequently recomposed
Parfum / Extrait de Parfum	The highest concentration in most lines	Any fixed percentage; there is no legal threshold for the term
Le Parfum	A named version positioned above the EDP, not necessarily an extrait	That it is the same thing as “Parfum” on another bottle from the same brand
Intense	A denser or darker reading of the theme	Higher concentration; it can be a separate composition at the same strength
Extreme / Extrême	The same intention as Intense, in a different brand’s vocabulary	Any relationship to concentration
Elixir	A richer, sweeter or more resinous interpretation, often with amplified base notes	An extrait concentration; the term is purely a name
Absolu / L’Absolu	A concentrated or more floral-dense reading	That it contains an absolute in the technical extraction sense
Eau Fraîche	A lighter, fresher, usually citrus-lifted version	A defined concentration; historically it sat below EDT
Noir / Nuit / Dark	A warmer, spicier or more ambery counterpart	Any concentration relationship at all
Cologne	In modern designer use, a light version of an existing line	The traditional eau de cologne structure or strength

The consequence is practical. If you liked Dior Sauvage Eau de Toilette and someone tells you the Elixir is “the same but stronger,” they are guessing. Sauvage Elixir, launched in summer 2021 and composed by François Demachy, was described by Dior as reworking Sauvage’s freshness with new woody and spicy nuances. That is a different fragrance wearing a familiar name.

What do real family trees look like?

Line	Original	Subsequent named versions	Perfumer continuity
Bleu de Chanel	Eau de Toilette, 2010, composed by Jacques Polge	Eau de Parfum (Jacques Polge); Parfum (Olivier Polge). Concentration years come from fragrance databases, not from Chanel	Father to son, inside the same house
Dior Sauvage	Eau de Toilette, 2015, composed by François Demachy	Eau de Parfum; Parfum; Elixir, reported as summer 2021, all under Demachy. Dior does not publish launch years for the line extensions	One perfumer across the line until 2021
Yves Saint Laurent MYSLF	Eau de Parfum	Le Parfum; L’Absolu; Eau de Toilette Intense. Individual years are database-sourced and are not stated	MYSLF Absolu credited to Givaudan perfumers Daniela Andrier, Antoine Maisondieu and Christophe Raynaud
Guerlain Shalimar	Composed by Jacques Guerlain, 1925	Eau de Toilette; Eau de Parfum; Extract; Shalimar L’Essence, an Eau de Parfum Intense released in 2025 for the centenary	Maintained in-house by Thierry Wasser since 2008
Yves Saint Laurent Opium	1977, composed by Jean Amic and Jean-Louis Sieuzac of Roure	Black Opium, 2014, a separate composition that became the brand’s driving franchise	None; a franchise flanker rather than a reworking

Shalimar is the clearest case of a family tree that is genuinely a tree rather than a marketing exercise. The 1925 composition is still there, the concentrations are still sold, and the 2025 centenary release sits on the same trunk. Compare Shalimar Eau de Parfum with Shalimar Eau de Toilette and you are comparing branches of one idea.

Black Opium is the clearest case of the opposite. It shares a name with a 1977 spiced ambery classic and is a coffee-vanilla gourmand from 2014. Both are legitimate; they are simply not versions of each other. An Yves Saint Laurent marketing director has said of it: “We launched a lot of big successes… Black Opium, which definitely changed our destiny.”

Why does the flanker sometimes become the main line?

Three reasons, and none of them is that the flanker is better.

First, the flanker is aimed at the market that exists now, while the original was aimed at the market of its launch decade. Opium was composed for 1977. Black Opium was composed for 2014, when gourmands dominated women’s fragrance. The flanker inherits the name’s authority and drops its dated style.

Second, the flanker usually gets the advertising. Once a brand decides a flanker is its growth engine, the original’s media support quietly stops. L’Oréal’s own 2025 reporting lists Yves Saint Laurent Libre and MYSLF among the global top fifteen fragrances, and describes Libre as the number one feminine fragrance worldwide. Opium is not in that sentence.

Third, the flanker usually goes where the customer shops. Newer releases get the prominent testers, the gift sets and the travel-retail placement.

The visible result is a line where the original has become the obscure member of its own family. That is worth knowing before you order the thing everyone is discussing and discover it bears little resemblance to the classic you were told it descends from.

How do I tell which version I am actually buying?

What does “vintage” honestly mean, and what does it not?

In fragrance, “vintage” has no official definition. In practice, sellers use it to mean one of three quite different things, and it is worth knowing which one you are being offered.

An older production run of a fragrance still sold today. This is the most common meaning, and it is a claim about the formula: that the bottle predates a reformulation. It can be true, and it is verifiable only by dating the fill.

A discontinued fragrance. Here vintage just means unavailable. The formula question does not arise, because there is nothing current to compare it with.

A very old bottle as an object. Collectible packaging, a presentation flacon, a sealed box. The liquid may or may not be in good condition.

What vintage does not mean is “better.” Three things work against the assumption. Older bottles have had decades of exposure to heat, light and oxygen unless they were stored carefully, and top notes are the first casualty. Reformulation is not one-directional: some revisions were forced by safety restrictions and lost material, while others were improvements in stability or raw-material quality. And a bottle’s age tells you nothing about how it was stored, which matters more than the year.

There is one institution that takes the question seriously. The Osmothèque in Versailles, founded on 26 April 1990 by Jean Kerléo with senior perfumers including Jean-Claude Ellena and Guy Robert, holds over 3,000 perfumes, stores them at constant temperature under argon gas, and reconstructs discontinued formulas from archived records. If you want to know what a fragrance smelled like in 1925, that archive is the answer, not a bottle from an auction site.

For most buyers, the practical position is this: buy a current bottle you have smelled and liked, and treat vintage as a specialist pursuit with real risk of paying a premium for a degraded liquid.

Myths worth correcting

“Elixir means extrait de parfum.” No. Elixir is a brand name for a version, with no defined concentration behind it. Two brands’ Elixirs have no necessary relationship to each other.

“Intense always means higher concentration.” Frequently it means a different composition at a similar concentration, made denser or warmer by formula rather than by strength.

“The Eau de Parfum is just the Eau de Toilette with more oil.” Rarely. Adding oil to an existing formula changes its balance, so higher-concentration versions are usually recomposed, which is why an EDP can smell less like the EDT than a different fragrance would.

“A flanker is a cash grab and always worse.” Some are excellent and some have eclipsed their originals commercially and critically. Bleu de Chanel Parfum was composed by the house’s own head perfumer. Judge the fragrance.

“Vintage bottles are always better than current ones.” Age is not preservation. An unsealed bottle stored in a warm bathroom for twenty years is not a superior product, and reformulation has sometimes improved a fragrance’s stability or performance.

“Reformulation always means cheapening.” Safety regulation, material availability and supply changes drive a large share of it, on timetables set by IFRA amendments and EU labelling law rather than by cost-cutting alone.

“If the box looks the same, the juice is the same.” Packaging is often carried over across formula revisions. The allergen list and the batch code change; the artwork may not.

The honest limits of this article

Flanker launch years are the weakest data in this cluster. Brands do not maintain public launch archives, press releases disappear, and the same fragrance can appear in one market a year before another, so the year attached to a flanker in any database is an approximation of a rollout rather than a date of record. The Sauvage Eau de Parfum and Parfum years here come from fragrance databases rather than from Dior, and should be treated as second-tier. MYSLF’s cascade of four versions is corroborated by the Fragrance Foundation credit for MYSLF Absolu but the individual year for each version comes from a listing database. No brand publishes the fragrance-oil percentage of any concentration, so the concentration ladder described here is convention rather than specification, and claims that a given Elixir is “20%” are not sourced to anyone who would know. The allergen and IFRA timetables are accurate as cited but apply to the EU and to IFRA members respectively, and a product sold in the US may carry different labelling. Finally, this article deliberately does not tell you how to date a bottle from its batch code, or explain the chemistry of reformulation, or set out what each concentration term means in percentage terms, because each of those has a dedicated article that treats it properly.

What our own catalogue shows

The vocabulary is common enough to count. Across the 3,832 bottles we list, about 260 carry at least one of the modifier words this article has been picking apart: Intense on about 106, Noir on 46, Elixir on 39, Nuit on 24, Absolu on 22, Le Parfum on 18, Eau Fraîche on 13 and Extrême on 12. A single bottle can carry two of them, which is why the individual counts add up to more than 260. Roughly one bottle in fifteen, then, is named in a way that implies a relationship to another bottle — and as the table above shows, not one of those words is defined by anything except the brand that chose it.

The top of the concentration ladder is also smaller and stranger than the marketing suggests. About 171 of our listings, roughly 4%, are labelled parfum or extrait de parfum, and the brands selling the most of them are not the houses whose Elixirs and Intenses fill the shelves: Tiziana Terenzi (about 14), Mind Games (12), Francesca Bianchi (11), Roja Parfums (10) and Nishane (7) lead it, with Armaf the only high-volume name anywhere near the top at about 6. The extrait tier belongs largely to small niche houses. When a designer brand releases one, it is usually a flanker strategy rather than a house speciality.

We have deliberately not published a ranked list of the fragrance families with the most named versions. Counting them would mean first deciding which names belong to the same family, and that is exactly the judgement this article has just shown you cannot make from a bottle: Opium and Black Opium share a name and nothing else, while Shalimar’s concentrations share a composition. A count built on name-matching would smuggle in the very assumption it was supposed to test.

Bottles to try this on

Pairs that teach you to read a family tree on skin rather than on a database: Dior Sauvage Eau de Parfum against Sauvage Elixir; Bleu de Chanel Eau de Toilette against Bleu de Chanel Parfum; Black Opium against Yves Saint Laurent Opium, which share a name and little else; YSL MYSLF against MYSLF Le Parfum; and Shalimar Eau de Toilette against Shalimar Eau de Parfum.

Common questions

What is a flanker in perfume?

A new fragrance released under an existing fragrance’s name, such as Sauvage Elixir or Bleu de Chanel Parfum. It inherits the original’s brand recognition and shelf space. It may be a higher concentration of the same idea, a different composition on the same theme, or a largely unrelated fragrance carrying a familiar name.

Does Elixir mean a stronger version?

Not reliably. Elixir is a name, not a concentration, and no regulator defines it. Dior’s Sauvage Elixir, reported as released in summer 2021 and composed by Francois Demachy, was described by the brand as reworking Sauvage’s freshness with new woody and spicy nuances, which makes it a different fragrance rather than a concentrate of the original.

What is the difference between Parfum and Le Parfum?

Usually the brand’s internal naming, nothing more. Parfum and Extrait de Parfum conventionally sit at the top of a concentration ladder, while Le Parfum is a named version positioned above the Eau de Parfum without any guaranteed concentration. Two bottles from the same house can use both terms with different meanings.

Is the Eau de Parfum just the Eau de Toilette with more oil?

Rarely. Increasing the oil load changes the balance of a formula, so higher-concentration versions are normally recomposed rather than simply strengthened. That is why an Eau de Parfum can smell noticeably different from the Eau de Toilette of the same name rather than like a louder version of it.

Why do brands release so many flankers?

Because a flanker inherits shelf space, search traffic, an existing customer and a sales record retailers will back, while a new name has to create all of that. It also rides on advertising already committed; one public fragrance licensee reported advertising and promotion at 15.2% of net sales in early 2025.

How can I tell if my bottle is the old or new formula?

Use the batch code to date the fill, which is the only method that gives a production date rather than a guess. As a secondary check, compare the allergen list on the outer carton: Regulation (EU) 2023/1545 adds 45 entries to the EU fragrance allergen labelling list, with compliance due for newly placed products by 31 July 2026 and for everything on the market by 31 July 2028.

Does vintage perfume smell better?

Not necessarily. Vintage has no official definition and usually just means an older production run. Decades of heat, light and oxygen degrade top notes first, and reformulation has sometimes improved stability or performance. Storage history matters more than the year on the box, and it is almost never disclosed.

Why did my favorite perfume change?

Most often because of safety regulation and material availability rather than cost-cutting alone. IFRA notified its 51st Amendment on 30 June 2023 with staged compliance deadlines, and its 52nd Amendment End of Consultation Letter of 31 August 2026 sets out 48 new restriction Standards and 15 revised ones, with notification expected in January 2027. Formulas move on those clocks.

Can a flanker replace the original fragrance?

Commercially, often yes. Black Opium launched in 2014 under the name of the 1977 Opium and became the brand’s driving franchise, and L’Oreal’s 2025 reporting names Libre and MYSLF among the global top fifteen fragrances rather than Opium. The original frequently loses its advertising support and retail prominence.

Where can I smell what a discontinued perfume was really like?

The Osmotheque in Versailles, founded on 26 April 1990 by Jean Kerleo with senior perfumers including Jean-Claude Ellena and Guy Robert. It holds over 3,000 perfumes, stores them at constant temperature under argon gas, and reconstructs discontinued formulas from archived records. That is a more reliable reference than an auction-site bottle.

September 14, 2026

Tag: concentration

Why the Same Perfume Costs Wildly Different Amounts

Why does one retailer charge twice what another does for the same bottle?

What is the grey market, and is it legal?

How much does parallel distribution actually change the price?

When is a parallel import actually a different product?

Are you comparing the same size and the same concentration?

What actually moves the price?

Does an older batch justify a lower price?

What do “MSRP” and “list price” discounts actually mean?

How do import rules and shipping change the price?

How low is too low?

How to compare two prices properly

What price alone cannot tell you

Bottles to try this on

Related reading

Common questions

Why is the same perfume so much cheaper on some websites?

Is grey market perfume fake?

Does a much lower price always mean a counterfeit?

Why does eau de parfum cost more than eau de toilette?

Should I trust a big discount off MSRP?

Does an older batch mean a worse bottle?

Is it worth paying more to buy from an authorized retailer?

Why do prices jump around during the year?

Do tariffs and import rules affect what I pay?

Is a very expensive listing more likely to be genuine?

Sillage, Projection and Longevity: What the Three Words Mean

What do sillage, projection and longevity actually mean?

Why are they independent of each other?

Why do two people describe the same fragrance completely differently?

How do you measure performance honestly?

How do you describe what you want without jargon?

Which performance myths are wrong?

Myth: sillage and projection are the same thing

Myth: a higher concentration always projects further

Myth: if you cannot smell it, it has worn off

Myth: performance is a fixed property of the bottle

Myth: rubbing your wrists together crushes the molecules

Myth: more sprays produce proportionally more sillage

The honest limits of this article

What to do with all of this when buying

What our own catalogue shows

Bottles to try this on

Common questions

What is the difference between sillage and projection?

Can a perfume last a long time but not project?

Why can other people smell my perfume when I cannot?

Does eau de parfum project more than eau de toilette?

How do I test how long a perfume lasts on me?

Why does the same perfume last longer on my friend?

Does rubbing your wrists ruin a fragrance?

Will spraying more make a fragrance project further?

Why do reviews of the same perfume disagree so much about longevity?

Does weather change how a fragrance performs?

Perfume Sizes Explained: Oz to ML, and Which Size to Buy

What is the exact conversion from ounces to ml?

Why are perfume bottles sold at 30, 50 and 100 ml?

Why does the bottle say 1.7 oz and 3.4 oz?

Why is price per millilitre the only honest comparison?

What are travel sizes, miniatures and atomisers?

How do you choose a bottle size?

Which perfume size myths are wrong?

Myth: one ounce is thirty millilitres

Myth: 3.3 oz and 3.4 oz are different bottles

Myth: the ounce figure is the real fill

Myth: the biggest bottle is always the best value

Myth: travel sprays are a weaker version

Myth: shelf labels are required to show price per ml

The honest limits of this article

Practical shortcuts

What our own catalogue shows

Bottles to try this on

Common questions

How many ml is 1 oz of perfume?

Is 3.4 oz the same as 100 ml?

Why do perfume bottles show two different measurements?

What size perfume can I take on a plane?

Is the 100 ml bottle always cheaper per ml than the 50 ml?

How do I calculate price per ml?