The essentials
A perfume note is a single scent impression a wearer perceives at a given moment in a fragrance. It is the perceptual unit that perfumers and reviewers use to describe how a composition unfolds, and it does not always correspond to a single raw material in the formula. A note named jasmine in a pyramid may come from natural jasmine absolute, from synthetic jasmine accords such as hedione, or from a combination of both calibrated to read as jasmine on skin (Fragrantica, accessed 2026-05-29).
Notes are organized by their volatility into three layers that form the olfactive pyramid: top, heart, and base. The pyramid is a descriptive model rather than a rigid structural rule, and modern compositions often blur the boundaries deliberately. The Société Française des Parfumeurs and ISIPCA in Versailles (France) both teach the pyramid as a foundational descriptive tool while acknowledging its limits for non-linear and abstract compositions (ISIPCA, accessed 2026-05-29).
A typical pyramid lists between three and twelve notes across the three layers, although the formula itself can contain dozens to hundreds of individual materials. The relationship between perceived notes and underlying formula is therefore complex: published pyramids are simplified maps of the olfactive experience, not ingredient lists. Reading them well requires understanding both what they say and what they conceal.
Note versus raw material
The distinction between a note and a raw material is foundational. A raw material is a single ingredient in the formula: an essential oil, an absolute, an isolate, or a synthetic aroma chemical. A note is what the wearer perceives in the finished composition, which may be the direct effect of one material, the combined effect of several materials forming an accord, or a perceptual illusion engineered by the perfumer.
Lily of the valley is the classical example. The flower yields no usable extract by traditional methods, so any lily of the valley note in a perfume is built from synthetics. Modern formulations rely on combinations of cyclamen aldehyde, Florol, and related materials following the restriction of older building blocks such as Lyral under IFRA Standards. The same logic applies to lilac, peony, freesia, and other flowers whose natural materials are economically or technically unavailable (IFRA, accessed 2026-05-29).
Top, heart, and base in the pyramid
The pyramid layers correspond to volatility ranges. Top notes are the most volatile materials, perceived within the first 15 to 30 minutes after spraying: citrus oils, aldehydes, light green molecules, and several synthetic aromachemicals. They give the opening impression and evaporate quickly. Heart notes follow, typically perceived between 30 minutes and three hours after application: most florals, spices, fruity facets, and intermediate woods.
Base notes are the heaviest, least volatile materials, perceived for several hours after application and sometimes detectable the next day on fabric: heavy woods such as sandalwood, balsams, musks, animalic notes, and many synthetic fixatives. They anchor the composition and slow the evaporation of the lighter materials above them. The transition between layers is gradual rather than abrupt, and modern formulas often use linear structures that resist neat pyramid classification (Perfumer & Flavorist, accessed 2026-05-29).
How notes unfold over time on skin
The time-based unfolding of notes on skin is a function of three variables: the volatility of each material, the concentration of the composition, and the interaction with skin chemistry. A higher concentration extends the duration of all layers; a higher skin temperature accelerates evaporation; a drier skin shortens the perceived presence of top and heart notes by absorbing less and projecting more.
This is why a fragrance evaluated on a blotter strip reads differently from the same fragrance on skin. Strips give a stable, abstract reading of the composition without the biological filter of skin. Skin testing requires patience because the full structure only reveals itself across the heart and into the drydown phase, usually between 60 and 90 minutes after application (Bois de Jasmin, accessed 2026-05-29). A serious evaluation therefore allocates at least this much time per fragrance.
Phantom notes and accord effects
An accord is a combination of materials engineered to read as a single perceptual impression, often distinct from any of the contributing ingredients. A cherry accord may use no natural cherry material at all but instead combine benzaldehyde, a touch of tonka, and a fruity ester to produce the recognizable cherry effect. The result is a phantom note: a perceived presence with no direct ingredient counterpart in the formula.
This technique is central to modern perfumery. Many marine, leather, and gourmand notes exist primarily as accords rather than as natural extracts. The leather note in a chypre, for instance, often comes from isobutyl quinoline, birch tar substitutes, and styrax balsam rather than from any literal animal-skin material. Understanding accords helps explain why the same listed note can read differently across compositions and why two perfumes citing the same raw material can produce widely different olfactive impressions.
Notes in marketing copy versus formula
Published pyramids serve both communication and marketing purposes. Houses simplify the formula into a digestible list of three to seven memorable notes per layer to help consumers navigate the catalog and to anchor advertising language. The pyramid is rarely audited against the actual formula, and several conventions distort the picture in predictable ways.
Heavy synthetic ingredients are often invisible in published pyramids, replaced by their olfactive cousin, even when they dominate the structure. Iso E Super, a major synthetic woody-amber material widely used since the 1990s, rarely appears by name but underlies a large share of contemporary niche compositions. Conversely, prestige naturals such as rose absolute or sandalwood are over-cited, sometimes appearing in pyramids of compositions where they contribute only marginally. Specialist databases such as Fragrantica and Parfumo cross-reference pyramids with user reviews to mitigate these distortions (Fragrantica, accessed 2026-05-29).
Reading a published pyramid critically
A useful habit when reading a pyramid is to ask three questions. First, do the named notes correspond to materials that actually exist as workable extracts, or do they belong to a category of phantom notes built from accords? Cherry, lily of the valley, gardenia, and lilac fall into the second category and are almost always synthesized. Second, do the listed notes match what the composition actually projects on skin? Third, what is not listed that the composition seems to contain?
This third question is the most informative. Niche compositions in particular often hide their structural backbone behind a list of decorative notes. A sample evaluated across two or three sessions, with reference to the published pyramid, usually reveals the gap between marketing language and olfactive reality. Building this critical reading is one of the core skills of a serious perfume evaluator and is taught at training institutions including ISIPCA and the Grasse Institute of Perfumery in France (ISIPCA, accessed 2026-05-29).
Sources
- Fragrantica, perfume entries and pyramid databases for individual fragrances. Accessed 2026-05-29.
- ISIPCA Versailles (France), Olfactive evaluation methodology, reference training material on the pyramid model.
- Perfumer & Flavorist, industry articles on volatility ranges and the limits of linear versus pyramidal compositions. Accessed 2026-05-29.
- IFRA, IFRA Standards, regulatory documents on restricted materials. Accessed 2026-05-29.
- Bois de Jasmin, Victoria Frolova, editorial articles on skin behavior and pyramid reading. Accessed 2026-05-29.