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  • Why Perfumes Get Reformulated

    Why Perfumes Get Reformulated

    Four reasons, in rough order of frequency: a raw material got restricted or banned, a raw material got expensive or unavailable, a captive molecule was discontinued, or someone decided the formula cost too much. Regulation gets the blame for all four. Only the first is actually regulatory.

    Which rules actually bind, and which do not?

    This distinction is the whole subject, and almost every popular account gets it wrong.

    The EU Cosmetics Regulation, Regulation (EC) No 1223/2009, is law. Its Annex II lists substances prohibited in cosmetic products. Its Annex III lists substances subject to restriction — concentration limits, conditions of use, or labelling requirements. A product containing an Annex II substance cannot legally be sold in the EU regardless of who made it or whether they belong to any trade body.

    IFRA Standards are not law. They are the International Fragrance Association’s self-regulatory program, binding on IFRA members and, in practice, on anyone whose customers demand an IFRA certificate — which is most of the supply chain. The Washington Post reported in 2021 that an estimated 80 to 90 percent of the perfume industry are IFRA members and follow its standards. The practical effect approaches that of law without being it: a non-member artisan in the United States selling direct is not bound by an IFRA Standard, while a supplier shipping concentrate to a multinational effectively is.

    In the United States, fragrance-specific allergen rules do not yet exist. The Modernization of Cosmetics Regulation Act directs the FDA to issue regulations identifying fragrance allergens requiring label disclosure and to set disclosure thresholds. As of early 2026 the FDA had not issued them. So the reformulations American consumers notice are almost always driven by EU law or IFRA Standards applied globally, because brands would rather run one formula than two.

    The two systems also do different things, which is a distinction worth holding onto. IFRA sets maximum use concentrations by product category. The EU’s allergen provisions in Annex III mostly set labelling obligations, not concentration caps: as one industry analysis puts it, “the final concentration of these fragrance allergens in the finished product is not restricted” by the Regulation itself. So when a fragrance gets weaker in a specific note, the cause is usually an IFRA ceiling, not an EU cap.

    What has IFRA actually restricted or banned?

    IFRA Standards come in three kinds: prohibitions, restrictions with a maximum use level by product category, and specifications setting purity or composition requirements on a material. The whole set is revised in numbered Amendments.

    The 51st Amendment, notified on 30 June 2023, added 48 new Standards and revised 11. Of the 48 new Standards, exactly one was a prohibition: 3-acetyl-2,5-dimethylfuran, CAS 10599-70-9, on genotoxicity grounds. Thirty-two were restrictions for dermal sensitization, eleven were restrictions derived from the second-generation quantitative risk assessment methodology, two used a threshold of toxicological concern approach, one addressed depigmentation, and one was a specification.

    Milestone Date Applies to
    51st Amendment notified 30 June 2023 All IFRA members
    Compliance with new Prohibition Standard 30 August 2023 New creations
    Compliance with Restriction and Specification Standards 30 March 2024 New creations
    Compliance with new Prohibition Standard 30 July 2024 Existing creations already on sale
    Compliance with Restriction and Specification Standards 30 October 2025 Existing creations already on sale
    52nd Amendment consultation opened 12 December 2025 Industry consultation
    52nd Amendment consultation closed 12 June 2026 Industry consultation
    End of Consultation Letter published 31 August 2026 Industry
    52nd Amendment notification expected January 2027 All IFRA members
    52nd Amendment compliance, new creations 11 months after notification New creations
    52nd Amendment compliance, existing creations 30 months after notification Existing creations

    The 52nd Amendment is the one currently driving reformulation work. IFRA’s End of Consultation Letter, published 31 August 2026, describes 48 new Restriction Standards addressing dermal sensitization — 37 of them with a systemic toxicity evaluation — plus 15 revised restriction standards and the withdrawal of two proposed standards. Notification is expected in January 2027. That means fragrances on shelves in 2027 and 2028 will be reformulated against rules that were already settled in 2026, which is the ordinary rhythm of this industry: the change reaches your nose two to three years after the decision.

    What has the EU actually banned?

    Instrument What it did Dates
    Commission Regulation (EU) 2017/1410 Added HICC (Lyral), atranol and chloroatranol to Annex II; deleted HICC’s Annex III entry 79. Based on the SCCS opinion of 26-27 June 2012 that these were the fragrance allergens causing the highest number of contact allergy cases Not placed on the EU market from 23 August 2019; not made available on the EU market from 23 August 2021
    Commission Regulation (EU) 2021/1902 (Omnibus IV) Added butylphenyl methylpropional (BMHCA, Lilial, CAS 80-54-6) to Annex II as entry 1666, among substances classified as CMR under Delegated Regulation (EU) 2020/1182. The reproductive-toxicity category 1B classification comes from the CLP entry; the regulation itself does not name a sub-category in its recitals. It had previously been an Annex III labelled allergen Applies from 1 March 2022, with no sell-off period
    Commission Regulation (EU) 2023/1545 Expanded individual fragrance allergen labelling. The recitals state that 24 allergens were previously individually labelled and that the SCCS identified 56 additional ones; the annex replaces 17 Annex III entries and adds 45 new entries (327-371), of which 21 are plant oils or extracts. Thresholds 0.001% leave-on, 0.01% rinse-off. Labelling only, not concentration caps Placing on market from 31 July 2026; making available on market from 31 July 2028
    REACH authorisation decision Musk xylene banned, announced 18 February 2011, on environmental persistence grounds. IFRA had already banned it under its own program 2011

    Two things about that table are worth stressing. The Lilial ban was a reproductive toxicity classification, not a skin sensitization decision — a completely different regulatory pathway from the one that catches most fragrance materials, and one with no sell-off period, which is why some products vanished from shelves rather than being reformulated. And 2023/1545 was a labelling measure, so it forced disclosure rather than removal. Its effect on formulas was indirect but real: brands that did not want a long allergen list on the box reduced or removed materials to stay under threshold.

    Was oakmoss banned?

    No. This is the most persistent error in fragrance writing, and getting it right matters because the actual mechanism is more interesting.

    Oakmoss extract itself is restricted, not prohibited. The IFRA Standard for oakmoss extracts — covering CAS 90028-68-5, 68917-10-2 and 9000-50-4 — is a combined restriction and specification. The version currently published in IFRA’s Standards Library is the Amendment 49 text of 2020, which means neither the 50th nor the 51st Amendment revised it. It sets maximum use levels by product category, and for fine fragrance, IFRA category 4, the limit is 0.10 percent in the finished product. Other categories run from 0.016 percent for underarm products up to no restriction at all for category 12, which covers non-skin-contact products such as candles.

    The specification half is the part that changed the smell. The Standard requires that “levels of Atranol and Chloroatranol should each be below 100 ppm in Oakmoss extracts.” Separately, the EU prohibited atranol and chloroatranol as substances under Regulation 2017/1410. So a supplier can still sell oakmoss extract, and a perfumer can still use it in a fine fragrance up to 0.10 percent, provided the extract has been purified to remove two specific naturally occurring constituents below detectable levels.

    The accurate summary: oakmoss was not banned, it was capped and cleaned. Purified low-atranol oakmoss is a commercial product. It does not smell the same as unpurified oakmoss, which is why classical chypres changed — but “IFRA banned oakmoss” is wrong in both the verb and the agent, since the substance ban came from the European Commission and applied to constituents, not to the extract.

    How do raw material supply and cost force reformulation?

    More often than regulation does, and with no announcement whatsoever.

    Vanilla is the documented case. A peer-reviewed analysis of vanilla price bubbles records prices around $20/kg in the 2008-2010 period, about $80/kg in 2014, rising to roughly $600/kg by 2017 and a record near $600/kg in May 2018, subsequently trading between $600 and $750. The 2014-2018 spike is attributed to rising demand, falling supply, speculation and Cyclone Enawo, which hit Madagascar’s vanilla-growing regions in March 2017. A thirty-fold move in a base material does not leave formulas untouched, and nobody puts out a press release about it.

    Political disruption does the same thing faster. The Washington Post reports that Chanel No 19 was reformulated after the 1979 Iranian revolution cut off galbanum supplies — a supply-driven reformulation four decades before the current regulatory wave, and a useful reminder that reformulation is not a modern phenomenon.

    Slow-growing woods are a structural version of the same problem. Sandalwood and agarwood cannot be scaled up on a product timetable, and trade in agarwood-producing genera is CITES-regulated. When a brief calls for oud in a globally distributed fragrance, the answer is reconstruction, and the reconstruction changes whenever its components do.

    Then there is straightforward cost engineering. A brand under margin pressure can ask for a formula to be re-costed downward, and the fragrance house will deliver a version that smells as close as it can at the new price. No regulation is involved, no announcement is made, and this is very likely the single most common cause of the changes enthusiasts notice.

    What happens when a captive molecule is discontinued?

    A captive is a molecule made by one fragrance house and available only in that house’s formulas. It is a competitive asset: a rival cannot match an effect they cannot buy.

    The vulnerability is obvious. If the house stops producing it — because the plant is repurposed, the volume no longer justifies the line, a feedstock became unavailable, or a new safety assessment made the risk unattractive — every fragrance built on it has to be rebuilt, and no substitute will be exact, because the whole point of a captive was that no substitute existed.

    Here the honest answer is that houses do not disclose this. Captive discontinuations are not announced, are not listed, and are visible to outsiders only as an unexplained change in a fragrance that no regulatory change accounts for. Any specific claim that a named fragrance changed because a named captive was withdrawn is, in the absence of a statement from the house, a hypothesis.

    How can you tell a reformulation from your own nose or a degraded bottle?

    Usually you cannot, with certainty. But the failure modes have different signatures, and the pattern of what changed narrows it considerably.

    Cause What you would notice What points away from it
    Regulatory reformulation A specific material class is quieter or gone — the mossy-bitter green in a chypre, the muguet in a floral — while the overall structure survives. Timing clusters near an amendment compliance deadline The whole fragrance is weaker rather than one facet; or the change predates any relevant deadline
    Cost reformulation Naturals thin out. Less texture, shorter arc, more obviously synthetic-smelling body. Often accompanied by packaging or size changes One specific note is gone while everything else is intact
    Supply-driven reformulation One expensive natural recedes and a reconstruction takes its place; often follows a documented crop failure or price spike Nothing correlates with a known supply event
    Oxidized bottle The top notes are the problem: citrus goes sour, waxy or turpentine-like, while the base is roughly intact. Worse in a part-used bottle, a warm bathroom, or one stored in light A brand-new sealed bottle behaves the same way
    Your own nose and expectation You cannot reproduce the difference blind. The old bottle smells different when you do not know which is which Two people who have never smelled the old version independently describe the same specific absence

    The single most useful discipline is the one perfumers use on themselves: smell blind. Have someone else spray two blotters from an old bottle and a new one, unmarked, and see whether you can sort them. Most people, most of the time, cannot — and that result is information, not a failure.

    The second most useful discipline is to distrust the note list. A published note pyramid is marketing copy and is frequently carried over unchanged through several reformulations, because it was never a description of the formula. See what a published note pyramid is really for.

    How reformulation actually happens, step by step

    1. A trigger arrives. An IFRA amendment is notified, an EU instrument is published, a supplier raises a price, a crop fails, or a brand asks for a cheaper version.
    2. The house screens its portfolio. Regulatory systems flag every formula carrying the affected material above the new limit — for an amendment touching dozens of materials, thousands of formulas per house.
    3. Affected formulas are triaged. Some need a dose reduction and nothing else. Some need the material replaced. Some cannot be saved in their current shape.
    4. A perfumer rebuilds. Usually not the original perfumer, and often decades later. The target is to match the existing product, not to improve it.
    5. The new version is compared against a retained reference. Houses keep samples of the original as the benchmark, which is why reformulations are usually close rather than arbitrary.
    6. The brand approves, or does not. A brand that dislikes every option may accept a change it would rather not, because the alternative is not selling in that market.
    7. The new formula phases in. Old stock continues to sell alongside new stock, which is why two bottles bought the same week can differ.
    8. Nothing is announced. There is no regulatory obligation to disclose a formula change, and the note list on the box usually does not change.

    Which reformulation claims are wrong?

    “IFRA banned oakmoss”

    What is claimed: IFRA prohibited oakmoss, destroying the chypre family.

    What the evidence shows: The IFRA Standard for oakmoss extracts is a restriction plus specification. Fine fragrance (category 4) may contain up to 0.10 percent, and the specification requires atranol and chloroatranol each below 100 ppm in the extract. Separately, the European Commission prohibited atranol and chloroatranol as substances under Regulation 2017/1410.

    What people wrongly conclude: That oakmoss is unavailable and that IFRA banned it. Purified oakmoss is a commercial product; the substance ban came from the Commission and applied to two constituents, not to the extract.

    “IFRA is a law and IFRA limits are legal limits”

    What is claimed: IFRA Standards have the force of regulation.

    What the evidence shows: IFRA is the industry trade association’s self-regulatory program, binding on members. The Washington Post put member coverage at an estimated 80 to 90 percent of the industry. Regulation (EC) No 1223/2009 is the binding law in the EU. In the US, the FDA had not issued MoCRA fragrance allergen regulations as of early 2026.

    What people wrongly conclude: That an IFRA limit is enforceable by a government, or that a small non-member producer is breaking the law by exceeding one. Neither is true, though exceeding an IFRA limit will usually end a commercial relationship.

    “The EU limits how much allergen a perfume can contain”

    What is claimed: Annex III caps allergen concentrations.

    What the evidence shows: For the declared fragrance allergens, Annex III mostly sets labelling thresholds — 0.001 percent leave-on, 0.01 percent rinse-off — and industry analysis notes that the final concentration of these allergens in the finished product is not restricted by the Regulation itself. IFRA sets the concentration ceilings.

    What people wrongly conclude: That a long allergen list on a box means the product is near a legal limit. It means those substances are present above a disclosure threshold, which for a leave-on product is one part in a hundred thousand.

    “Lilial was restricted for causing allergies”

    What is claimed: Lilial went the way of Lyral, as a sensitizer.

    What the evidence shows: Butylphenyl methylpropional was added to Annex II by Regulation (EU) 2021/1902 on the basis of a CMR category 1B classification for reproductive toxicity, applying from 1 March 2022 with no sell-off period. It had previously been an Annex III labelled allergen, but the ban came through the CMR route.

    What people wrongly conclude: That all fragrance restrictions run through skin sensitization. They do not, and the CMR route is faster and harsher: no transition, no sell-off, products off shelves.

    “My bottle was reformulated”

    What is claimed: A fragrance that smells different from memory has been changed.

    What the evidence shows: Top notes are the least stable part of a composition, and oxidation in an opened bottle reliably degrades them first, which reads as exactly the same symptom people attribute to reformulation. Reformulations do happen and are not announced, so the claim is often correct — but a part-used bottle stored warm is the more common explanation, and almost nobody tests it blind.

    What people wrongly conclude: That the difference proves a formula change. It proves a difference. Blind comparison against a fresh bottle is the only way to separate the two, and even then you are comparing two bottles, not two formulas.

    The honest limits of this article

    You cannot verify a reformulation from outside. Houses have no obligation to announce formula changes and generally do not; the note list on the packaging is marketing copy and usually survives unchanged; and even a gas chromatography trace of two bottles would show differences caused by age and storage as well as by formula. So every claim of the form “fragrance X was reformulated in year Y because of Z” is inference unless a house has said so. The named examples here — Chanel No 19 and galbanum, Guerlain Mitsouko and Thierry Wasser’s reworking — come from newspaper reporting rather than company statements, and should be read at that level of confidence. Regulatory dates and limits, by contrast, are drawn from the instruments themselves and from IFRA’s notification documents, and are as solid as anything here gets.

    What to do with this as a buyer

    Three practical conclusions.

    Stop treating reformulation as a moral event. A formula that has been rebuilt to survive a category limit is not a cheapened product, and a formula rebuilt to hit a lower cost target might be. Those are different things with the same symptom, and the only signal that distinguishes them is which part of the fragrance changed: one missing facet points to regulation or supply, uniform thinness points to cost.

    What our own catalogue shows

    You can watch the vocabulary shift in our own listing copy, with a caveat attached. Of the 3,832 bottles we list, about 43 mention oakmoss. Lyral, hydroxyisohexyl 3-cyclohexene carboxaldehyde and lilial appear in none — a fact about copywriting, not chemistry. Restricted materials were never the sort of thing marketing copy named, so their absence tells you nothing about any formula. What the oakmoss count shows is that a material can stay in the language of perfumery long after its use has been capped, which is how a note list survives a reformulation unchanged.

    How much of what is on sale today predates these restrictions is a question we cannot answer from our own catalogue. A product listing records a name, a size, a price and a code — never a release year. Any figure would have to be assembled from marketing prose, which is exactly the kind of number this article argues you should not trust. A great many fragrances sold now under a pre-2000 name have been rebuilt at least once, and the bottle will not tell you.

    Bottles to try this on

    Buy the current version if you like the current version. Chasing a vintage bottle means buying an unknown storage history, and an oxidized original is objectively further from the perfumer’s intent than a compliant reformulation. If you want to hear how a classical chypre-adjacent structure reads now, Guerlain Shalimar and Chanel No 5 are both current-production references built on materials that have been through several regulatory cycles, and both still work.

    Recognize which fragrances are structurally exposed. A fragrance whose identity rests on one restricted natural is fragile; one built on synthetics with stable supply is not. A woody-amber composition such as Terre d’Hermès or Dior Sauvage Eau de Parfum is comparatively insulated, because the materials carrying it are manufactured to specification. An oud-led fragrance like Tom Ford Oud Wood depends on a reconstruction whose components can be revised at any time. And a single-material fragrance such as Escentric Molecules Molecule 01 is the extreme case in both directions: nothing to cheapen, and nowhere to hide if that one molecule is ever restricted.

    Related reading

    Common questions

    Why do perfumes get reformulated?

    Four main reasons: a raw material was restricted or banned, a raw material became expensive or unavailable, a captive molecule was discontinued, or the brand asked for a cheaper formula. Only the first is regulatory. Cost-driven reformulation is probably the most common and is never announced.

    Did IFRA ban oakmoss?

    No. The IFRA Standard for oakmoss extracts is a restriction with a specification, and the version published in IFRA’s Standards Library is still the Amendment 49 text of 2020. Fine fragrance may contain up to 0.10 percent, and the extract must contain atranol and chloroatranol each below 100 ppm. Separately the European Commission banned those two constituents as substances in 2017. Purified oakmoss remains a commercial material.

    Is IFRA a law?

    No. IFRA Standards are the fragrance industry’s self-regulatory program, binding on members and in practice on anyone whose customers require an IFRA certificate. Reporting in 2021 put member coverage at an estimated 80 to 90 percent of the industry. The binding law in the EU is Regulation (EC) No 1223/2009.

    What is the current IFRA amendment?

    The 51st Amendment, notified 30 June 2023, is the one in force; its final compliance deadline for existing creations was 30 October 2025. The 52nd Amendment’s consultation closed on 12 June 2026 and IFRA published its End of Consultation Letter on 31 August 2026, with notification expected in January 2027.

    Why was Lilial banned?

    Through the CMR route rather than the skin-allergy route. Butylphenyl methylpropional was added to Annex II of the EU Cosmetics Regulation by Regulation (EU) 2021/1902 as entry 1666, among substances classified as CMR, and the ban applies from 1 March 2022 with no sell-off period. That is why some products were withdrawn rather than reformulated.

    Does the EU limit how much allergen a perfume can contain?

    Mostly no. For the declared fragrance allergens, Annex III sets labelling thresholds of 0.001 percent in leave-on and 0.01 percent in rinse-off products. Industry analysis notes the final concentration in the finished product is not restricted by the Regulation. IFRA Standards set the concentration ceilings.

    How can I tell if a perfume has been reformulated?

    From outside, usually you cannot be certain. Look at what changed: one missing facet suggests regulation or supply, uniform thinness suggests cost, and a sour or turpentine-like top with an intact base suggests an oxidized bottle. Then test blind, because most people cannot sort unmarked blotters reliably.

    Is a reformulated perfume worse?

    Not necessarily. Houses rebuild against a retained sample of the original, so the target is to match rather than to change. A regulatory reformulation can be close; a cost reformulation is usually thinner. An oxidized vintage bottle is often further from the perfumer’s intent than the current compliant version.

    What is a captive molecule?

    A molecule made by one fragrance house and available only in its own formulas, which prevents rivals from matching a particular effect. If the house stops producing it, every fragrance built on it has to be rebuilt with no exact substitute. Houses do not announce captive discontinuations, so outsiders cannot track them.

    Do brands have to say when they change a formula?

    No. There is no obligation to announce a formula change, and published note lists are marketing copy that usually survives unchanged through reformulations. Ingredient labels list declarable allergens above threshold, which can shift, but they do not describe the formula.

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

    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.

    1. 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.
    2. 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.
    3. 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.
    4. 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.
    5. 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.
    6. 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.
    7. 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.

    Related reading

    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.

  • Fragrance Notes Explained: Top, Heart and Base

    Fragrance Notes Explained: Top, Heart and Base

    The fragrance pyramid describes volatility, not a recipe. Top notes are the most volatile materials and are largely gone in 15 to 30 minutes; heart notes carry the character for roughly 3 to 4 hours; base notes persist beyond that. Every material is present from the first spray. The pyramid is a convention, not a disclosure.

    That last distinction is the useful one. Once you know the pyramid is describing evaporation rates rather than a list of what went into the bottle, a published note list becomes readable — as marketing, as a rough performance forecast, and as a very partial description of a formula nobody publishes.

    What does the fragrance pyramid actually describe?

    It describes the order in which materials leave your skin.

    A fragrance compound is a mixture of aroma materials with different vapour pressures. High vapour pressure means a material evaporates quickly; low vapour pressure means it lingers. Nothing takes turns. Every material in the bottle is on your skin from the moment you spray, and every one of them begins evaporating at once. What changes over the next several hours is the proportion of each material still present and still producing detectable vapour.

    In perfume engineering, the perceived intensity of a single material is its odour value: the concentration of that material in the air divided by the concentration at which a nose can just detect it. Both halves matter. A material with a high vapour pressure fills the air fast and then runs out. A material with a very low detection threshold stays perceptible long after most of it has gone.

    So the three tiers are not three stages of a performance. They are three speed bands in one continuous process. The engineering literature describes the sequence as a blooming phase, a development phase and a lasting phase, which is a better mental model than a staircase.

    How long does each tier last?

    The figures below are the ones given in the published technical literature, as general descriptions of material classes on skin. They are not guarantees for any particular bottle, and no regulation or standard defines them.

    Tier Physical property Published time on skin (general description, not a specification) Material families typically placed here What the tier reliably predicts
    Top notes Highest vapour pressure; evaporate fastest 15–30 minutes Citrus oils, light green materials, aldehydes, some fresh herbs, mint The first impression, and almost nothing about how the fragrance will smell at hour four
    Heart / middle notes Intermediate vapour pressure About 3–4 hours Florals, spices, leather materials, fruity materials The fragrance’s character as most people will experience it
    Base notes Lowest vapour pressure; evaporate slowest More than 4 hours; some materials remain on fabric far longer Musks, amber materials, woods, resins, vanilla-type materials, patchouli How long the fragrance lasts, and what remains at the end of a working day

    A fourth element belongs in this table and is usually left out: the fixative. A fixative is defined in the perfume-engineering literature as a chemical ingredient, usually of low volatility, that changes the rate of evaporation of both the top and the middle notes and improves stability, so the perfume lasts longer. A fixative does not simply sit at the bottom of the pyramid. It slows down the materials above it. This is one reason two fragrances with apparently similar note lists can behave completely differently. The three words people reach for to describe that behavior — sillage, projection and longevity — describe three separate properties, and a note list predicts none of them well.

    Where did the three-tier pyramid come from?

    From a perfumer’s teaching method, not from a laboratory or a regulator.

    The structure is attributed in the technical literature to Jean Carles (1892–1966), a French perfumer at Roure in Grasse who founded the company’s perfumery school. The attribution of the three tiers to him is the load-bearing point and comes from the engineering literature; the biographical detail around it rests on encyclopedic sources. A 2021 review in Molecules states the definition directly: “A perfume, according to Jean Carles, is a liquid mixture of top notes (first impact, fresh), middle notes (main perfume character) and base notes (long-lasting) in solvents.”

    Carles worked from the relative volatility of perfumery materials and taught students to build a composition from the base upward, adding the more volatile materials last. That is an excellent way to teach construction to someone who cannot yet hold a hundred materials in their head. It was never intended as a consumer disclosure format.

    The pyramid became one because it is a good story. It gives a fragrance a beginning, a middle and an end, it lets marketing copy name attractive things, and it gives a customer standing at a counter something to say. None of that makes it false. It makes it a simplification whose purpose is not accuracy.

    Is the note list on the box the formula?

    No, and the gap is larger than most people expect.

    A modern fine fragrance compound can contain dozens to hundreds of individual materials. A published note list typically names between six and fifteen things. It is not a shortened ingredient list; it is a different kind of object. Note names describe impressions a perfumer intends you to have. Ingredients are materials in a tank.

    Three things follow.

    Many notes have no corresponding extract

    Rose, jasmine, orange blossom, vetiver, patchouli and bergamot all exist as commercial extracts. Lily of the valley, lilac and honeysuckle largely do not; perfumery calls flowers of this kind silent flowers, and those impressions are built from synthetic materials assembled into an accord. The muguet, or lily-of-the-valley, accord is the clearest case. Butylphenyl methylpropional — trade-named Lilial — was described in patent literature as “an excellent perfume ingredient widely valued for its muguet odour note” that “has found wide use in fine perfumery as well as in personal and household care products.” It is a synthetic. There was no lily in it.

    Since the 1980s, perfumers have also had headspace analysis: enclosing a living flower in a sealed chamber, capturing the volatiles it emits and identifying them by instrument. The technique exists precisely because a living flower and a picked one do not emit the same mixture, and published comparisons show different volatile profiles for the same species living and cut. Specific compound percentages for that comparison circulate in secondary summaries; no primary measurement could be verified, so none are quoted here. A perfumer can reconstruct the living flower from synthetics regardless. The note list will say “jasmine.” No jasmine need have been harvested.

    Note lists survive reformulation; formulas do not

    Materials leave the palette for regulatory reasons. Butylphenyl methylpropional was added to the European Union’s list of substances prohibited in cosmetics as entry 1666 of Annex II, applying from 1 March 2022. Any composition that relied on it had to be rebuilt. The bottle can still say lily of the valley, because the note list describes the intended impression and the impression is what the reformulation tries to preserve. It is also part of the reason two people can wear the same bottle and describe two different fragrances.

    The ingredient list is the real disclosure, and it is getting longer

    On EU-compliant packaging, the whole fragrance mixture appears as a single ingredient named parfum, under Article 19(1)(g) of Regulation 1223/2009. Alongside it, specified fragrance allergens must be named individually once they exceed a threshold — 0.001 percent in leave-on products and 0.01 percent in rinse-off products. Commission Regulation (EU) 2023/1545 expanded that named list from 24 substances to 80, with compliance dates in 2026 and 2028. Those individually named materials are the only part of the compound the packaging actually reveals, and they will soon reveal considerably more than they used to.

    What you are looking at What it is What it can tell you What it cannot tell you
    The note pyramid on the brand’s page Marketing copy describing intended impressions The family and rough direction of the scent; a loose forecast of longevity from the base-note families named Which materials are in it, in what proportion, or whether any named natural is present at all
    “Parfum” or “Fragrance” in the ingredient list The entire fragrance compound, declared as one ingredient Roughly where the compound sits in the order of predominance Anything about composition. This is permitted generic labelling in both the US and the EU
    Individually named allergens after “parfum” Specified materials disclosed above 0.001% in leave-on products Actual materials genuinely present, above a very low threshold Proportions, and everything not on the specified list
    Concentration term (EDT, EDP, parfum) An unregulated category word Within one brand, a rough ranking of compound loading Any percentage, and any cross-brand comparison. See the concentration chart for what the term does and does not fix.

    How do you read a note list critically?

    1. Read the base notes first. They predict what you will be wearing for most of the day. A base of musk, amber materials, woods and resins forecasts persistence. A base named mainly as “white musk” and nothing else forecasts a quiet, close finish.
    2. Treat the top notes as a trailer. Fifteen to thirty minutes of material does not justify a purchase, and disliking the opening is not the same as disliking the fragrance.
    3. Count how many notes are named. Six to twelve is normal. A list of thirty is copywriting. A list of three usually signals a deliberately simple composition or a brand that chose not to publish more.
    4. Check whether the named naturals plausibly exist as extracts. Rose, jasmine, vetiver, patchouli, sandalwood, bergamot and oakmoss do. Lily of the valley, lilac, honeysuckle, sea spray, rain and leather are constructions. Neither fact makes a fragrance better or worse; it tells you the note list is describing effect rather than content.
    5. Look for repeated families across fragrances you already like. Personal patterns in the base and heart are far more predictive than any single note name. Four fragrances you love that all name patchouli is real information.
    6. Read the ingredient list for named allergens. If you have reacted to a fragrance before, this is where actual material names appear. It is the only part of the packaging that discloses composition.
    7. Do not compare note lists across brands as if they were standardised. Two brands can name “amber” for entirely different material sets. There is no controlled vocabulary.
    8. Test before you commit. The pyramid cannot tell you how a fragrance behaves on you. Only wearing it can. There is a method for testing properly, and it takes a day rather than a minute.

    Which fragrance-note myths are wrong?

    Myth: the notes arrive in sequence, one tier at a time

    The claim: you smell the top notes, then they finish and the heart begins, then the base.
    What the evidence shows: every material is on the skin from the first second and all of them evaporate simultaneously at different rates. Perceived intensity depends on how much of each material is in the air relative to its detection threshold, which changes continuously.
    What people wrongly conclude: that a fragrance which smells “wrong” at minute twenty is broken, when the composition is simply mid-transition.

    Myth: the pyramid is a proportional recipe

    The claim: the tiers reflect how much of each material is in the bottle.
    What the evidence shows: the tiers are volatility bands. A composition can be mostly base material by weight and still present as a bright citrus for the first half hour, because the volatile fraction dominates the early air.
    What people wrongly conclude: that a long list of top notes means a “fresh” fragrance overall.

    Myth: a named natural means the natural is in the bottle

    The claim: “jasmine” in the note list means jasmine absolute.
    What the evidence shows: note names describe impressions. Headspace analysis, developed in the 1980s, lets perfumers reconstruct a flower’s scent from synthetics, and for flowers such as lily of the valley there is no viable extract at all — those accords were built from materials like butylphenyl methylpropional, described in patent literature as “widely valued for its muguet odour note.”
    What people wrongly conclude: that synthetic materials are a substitution for something that existed. For many notes there was never a natural option.

    Myth: the pyramid is an industry standard

    The claim: top, heart and base are formally defined categories.
    What the evidence shows: the structure is attributed to Jean Carles as a compositional teaching method from the middle of the twentieth century. No regulation and no standards body defines the tiers or assigns materials to them.
    What people wrongly conclude: that two brands placing the same material in different tiers means one of them is wrong.

    Myth: a fragrance with the same notes will smell the same

    The claim: matching note lists means matching scents.
    What the evidence shows: a note list of ten names can sit over a compound of two hundred materials, and fixatives alter the evaporation rate of everything above them. Note lists are not a fingerprint and were never intended as one.
    What people wrongly conclude: that two fragrances sharing a note list are clones, or that a fragrance can be identified by its notes alone.

    Myth: if I cannot smell the base notes, the fragrance has worn off

    The claim: losing the scent means it is gone.
    What the evidence shows: repeated or prolonged exposure to an odorant produces a stimulus-specific decrease in sensitivity to it, which recovers over time once exposure stops. You adapt to what you are wearing faster than other people do.
    What people wrongly conclude: that they need to reapply, when others can still smell them clearly. If longevity really is the problem rather than your own nose, the things that genuinely help are mostly about application and storage.

    The honest limits of this article

    The tier timings of 15 to 30 minutes, 3 to 4 hours and beyond 4 hours are general descriptions of material classes from the published engineering literature, not measurements of any product. Real wear varies with the composition, with how much you applied, with the surface it is on, and with the person: a 2025 study reports that fragrance evaporation profiles depend on both skin properties and the intrinsic molecular properties of the fragrance, so the pattern differs between individuals. Note lists themselves are published by brands and are not verifiable from outside; no retailer can confirm what is in a compound, and this one has not tested, smelled or analysed anything described here. Where this article says a particular note is usually a construction rather than an extract, that reflects the general state of the raw-material palette rather than knowledge of any specific formula. Treat everything in a pyramid as a claim about intent.

    What the pyramid is actually good for

    It remains a useful shortcut in exactly one direction: reading the base gives you a rough forecast of persistence, and reading the heart gives you the family. That is worth something when you are deciding what to test. It is worth nothing as a substitute for testing.

    What our own catalogue shows

    One practical note before you go looking for a pyramid: most of the time there will not be one. Across the 3,832 bottles we list, fewer than 2% spell out all three tiers, and about seven in ten never use the word “note” at all. The pyramid is a teaching device that became a marketing device; it is not a standard field a retailer is handed and asked to fill in. Where a listing does publish one, read it as a description of the intended impression. Where it does not, you have lost less than you think.

    We would like to be able to tell you which base notes and which top notes turn up most often across what we sell, and we cannot: nothing in a product listing records the position of a material in a composition. That limitation is this article’s point in miniature. Note position is an editorial decision made by whoever wrote the copy, tier by tier and fragrance by fragrance. There is no field to count, because there is no standard to count against.

    Bottles to try this on

    Fragrances with unusually legible pyramids make good reference points for learning to read one. A composition built on a clear citrus opening over a woody base, such as Acqua di Parma Colonia, demonstrates the top-to-base transition plainly. A heavily base-weighted composition such as Baccarat Rouge 540 shows how little the opening predicts. For a classical floral heart, Chanel No 5 is the standard teaching example, and for a resin-and-wood base, Tom Ford Oud Wood makes the bottom of the pyramid easy to identify.

    Common questions

    How long do top notes last?

    Published technical descriptions put top notes at roughly 15 to 30 minutes on skin, because they are the materials with the highest vapour pressure. That figure is a general description of a material class, not a specification. Actual duration depends on the composition, how much you applied, and the individual wearing it.

    What is the difference between heart notes and middle notes?

    Nothing. They are two names for the same tier: the materials of intermediate volatility that carry a fragrance’s character once the opening has faded, conventionally described as lasting about 3 to 4 hours on skin. Brands use the two words interchangeably, and no standard prefers one over the other.

    Are the notes listed on a perfume the actual ingredients?

    No. A note list names impressions the perfumer intended, typically six to fifteen of them, over a compound that may contain hundreds of materials. The only composition disclosed on packaging is the generic ingredient parfum plus any individually named fragrance allergens above 0.001 percent in leave-on products.

    Why does my perfume smell different after an hour?

    Because the most volatile materials have largely evaporated and the proportion of what remains in the air has changed. Every material was present from the first spray; they simply deplete at different rates. What you smell at hour one is the heart, with the base beginning to dominate from roughly hour four.

    Who invented the fragrance pyramid?

    The three-tier structure is attributed in the technical literature to Jean Carles, a French perfumer at Roure in Grasse who founded the company’s perfumery school. He worked from the relative volatility of materials and taught composition from the base upward. It was a teaching method, later adopted as marketing copy.

    Is there really lily of the valley in a lily-of-the-valley perfume?

    Almost never, because no commercially viable extract of the flower exists. The accord is built from synthetics. Butylphenyl methylpropional, one of the best-known of them, was described in patent literature as widely valued for its muguet odour note, and it was banned in EU cosmetics from 1 March 2022, forcing reformulations.

    What is a fixative in perfume?

    A fixative is defined in the perfume-engineering literature as a chemical ingredient, usually of low volatility, that changes the evaporation rate of the top and middle notes and improves stability so the perfume lasts longer. It does not just sit at the base of the pyramid; it slows down the materials above it.

    Can two perfumes with the same notes smell different?

    Routinely. A ten-name note list can sit over a compound of hundreds of materials, brands use no controlled vocabulary for note names, and fixatives change how fast everything above them evaporates. Note lists are a description of intent, not a fingerprint, and cannot be used to identify or match a fragrance.

    Why can I smell a fragrance on someone else but not on myself?

    Olfactory adaptation. Repeated or prolonged exposure to an odorant produces a stimulus-specific decrease in sensitivity that recovers only once exposure stops. Because you are wearing it continuously, you adapt to it while others do not. Reapplying because you cannot smell it usually means applying more than anyone else wants.

    Do base notes matter more than top notes?

    For most purchasing decisions, yes. Base materials determine what you are wearing for the majority of the day and are the best available forecast of longevity from a published note list. Top notes are largely gone in 15 to 30 minutes, which is a poor basis for buying a bottle you will wear for years.