A fragrance is judged at three different moments, and the same composition is effectively three products in sequence. The first minute is a burst that the wearer may or may not like. The next two hours are the character that most perfumers regard as the composition itself. What remains eight hours later is what the wearer remembers and what the people around them notice.
This article explains how the three phases are built, how the materials in each behave, what actually determines longevity, and how to write a brief in three timescales rather than one.
Why the trade talks in time rather than in ingredients
Perfumery describes a composition by when its materials are perceived, not by what they are, because that is the axis the wearer experiences.
Every odour material has a volatility, and volatility decides when it leaves the skin and the product film. The most volatile materials are perceived within seconds and are gone within minutes. The least volatile materials may still be detectable many hours later. A composition is built by choosing materials across that range and controlling the proportions so that the transitions feel intentional rather than accidental.
The three names for the phases are top, heart and base, and they are approximate. The phases overlap heavily: the heart begins before the top has finished disappearing, and the base is present from the first moment at a low level. The names describe dominance, not sequence. A composition where the base is genuinely absent for the first ten minutes does not exist; a composition where the base is inaudible until the heart fades is simply an unbalanced one.
The reason this matters commercially is that two formulas with identical ingredient lists at different proportions produce entirely different products. Proportions are the design. Our formulation ratios article covers the non-odour part of the same balance.
Top notes: the first five minutes
Top notes are the high-volatility materials, and their job is to make the first impression and then get out of the way.
The classic top materials are citrus: bergamot, lemon, mandarin, grapefruit. Alongside them sit the light green materials that suggest cut grass and leaves, the light fruit materials, the aldehydes that give a waxy-clean lift, and the more volatile aromatic materials. All of them leave the skin quickly, which is why a composition cannot be built on them if the brand wants the scent to be present after an hour.
The craft in the top is balancing brightness against sharpness. A high proportion of citrus reads clean and refreshing; too much and it reads thin, or brief, or like a household product. A common technique is to support the citrus with a light floral or a touch of something sweet, which rounds the acidity without slowing the opening much.
Top notes are also the part of a fragrance most affected by the carrier. A high-alcohol product throws them outward immediately and makes them louder; a concentrated oil-based product suppresses them, which is why an oil-based version of the same composition often reads as a different scent. Our perfume formulation article covers that difference.
Heart notes: where the composition lives
The heart, sometimes called the middle notes, is the body of the fragrance and the phase that most wearers would recognise as the scent if they were asked to describe it.
The heart is built from florals, spices, some fruits, and the softer woods and green materials that sit in the middle of the volatility range. Rose, jasmine, ylang, geranium, cinnamon, clove, the fruity notes and the powdery materials all live here. Their evaporation is measured in hours rather than minutes, so they dominate the period when the fragrance is on the skin and being noticed.
Because the heart is where the wearer spends the most time, it is where the composition has to be interesting rather than merely pleasant. A flat heart is the most common reason a fragrance is described as nice but forgettable. The usual fix is a contrast within the heart: something green against something sweet, or a spice against a floral, so that the phase has internal movement.
The heart is also the phase most sensitive to the base beneath it. A strong base can push the heart forward and make it feel brighter; an overwhelming base can bury it. Getting that balance right is the part of the work that takes the most iterations, because it can only be judged over the full wear rather than on a blotter in the first minute.
Base notes: what the wearer remembers
The base is the slowest phase and the one that decides whether a fragrance is perceived as a fragrance or as a spray that has worn off.
Base materials are the woods, the resins and balsams, the musks and the amber-type materials. They evaporate over many hours, and some remain detectable on fabric for days. A well-built base does two things at once: it gives the composition a tail of its own, and it slows the departure of the materials above it.
The second function is the less obvious one. A base material that is compatible with the heart materials will hold them in the film and release them more gradually, extending the whole wear. That effect is what the trade calls fixation, and it is the reason a higher concentration can improve longevity without changing the composition in any other way. Our concentration article covers where that effect stops working.
The base also carries the risk. Modern musk materials are used at high levels because they are perceived as clean and because they are cheap relative to natural materials, and an over-generous base reads as laundry rather than as perfume. Old resins give depth but can make a composition feel heavy and can create solubility problems at low temperature. The base is where a formula most often needs a second draft.
Evaporation curves and how the phases overlap
It helps to picture the composition as three curves that rise and fall at different rates rather than as three sequential stages.
The top curve rises within seconds, peaks in the first minutes and falls away. The heart curve rises more slowly, peaks between thirty minutes and two hours and declines gradually. The base curve rises slowly, peaks late, and declines over many hours, sometimes double-digit hours on fabric.
What the wearer perceives at any moment is the sum of the three. This explains several effects that otherwise seem arbitrary. A composition can seem to disappear at around the three-hour mark even though the base is still present, because the heart has fallen and the base is quiet. A composition can seem to change character completely after an hour, because the balance between the curves has shifted rather than any ingredient having gone.
The design implication is that the transitions are as important as the phases. A composition is judged on the moment the top drops away and the heart takes over; if that moment sounds like a gap, the wearer experiences the fragrance as having faded, even though nothing measurable has happened.
Longevity, sillage and tenacity are three different things
The words are often used interchangeably in marketing copy, and they measure different properties, which is why a fragrance can be strong and short or weak and long.
Longevity is how long the fragrance remains perceptible on the skin. Sillage, or projection, is how far from the wearer it can be noticed. Tenacity is how long it persists on a surface such as fabric or hair. A composition built on high-volatility materials with a large alcohol share can have strong sillage and short longevity. A composition built on heavy materials can have long tenacity on skin and low projection.
Brands usually discover the distinction when they test a formula on paper, on skin and on a scarf and get three different verdicts. The brief should say which of the three matters, because they are not always achievable at once and the choice changes the material selection. Our scent strength article covers the same trade in body care.
Testing on skin, on blotter and on fabric
Each substrate answers a different question, and a development programme that uses only one of them will make mistakes.
A blotter shows the composition without skin chemistry: it is the fairest view of the formula as designed, and it is how the phases are evaluated in development. It also overstates the base, because paper holds heavy materials and does not release them the way skin does.
Skin shows the composition as the consumer experiences it, and it introduces the variables of temperature, oiliness and moisture. The same fragrance can be noticeably sweeter on one wearer and drier on another, and a development programme normally uses several panellists for exactly this reason.
Fabric shows tenacity and tells the brand what the product will do to clothing. This is not a minor matter: a fragrance with a high base load can persist through a wash, and a dark or resinous composition can mark light fabrics. Both are consumer complaints rather than formulation failures, and both are answerable by testing. Our packaging compatibility article covers the related testing on the finished pack.
Building a brief in three timescales
- Describe the first five minutes: bright, fresh, sharp, soft, sweet, clean, or something else.
- Describe the main body: which family, how dense, how sweet, how floral or how dry.
- Describe what should remain after eight hours: a wood, a musk, a resin, a faint floral, or nothing much.
- Say which property matters most: longevity, sillage, tenacity or simply character.
- State the application ritual, since a spray and a dabber give different results from the same formula.
- Say where the product will be worn and in what climate, because both change the balance.
- Ask which material carries the base, so the brand knows what it is committing to in the ingredient list.
- Ask for a wear test on skin at defined intervals rather than a single evaluation at the start.
Materials by layer and the risk each carries
| Layer | Typical materials | Role | Risk if over-weighted |
|---|---|---|---|
| Top | Citrus, light green, aldehydes, light fruits | First impression, lift, freshness | Reads thin or brief, or like a household product |
| Top to heart bridge | Aromatic herbs, light spices | Prevents a gap as the citrus falls | A medicinal or savoury edge |
| Heart | Rose, jasmine, ylang, geranium, powdery notes | The character the wearer lives with | Flat or cloying, with no internal contrast |
| Heart to base bridge | Softer woods, light resins, some fruits | Carries the composition downward smoothly | A dull middle where nothing is perceived |
| Base | Woods, musks, resins, balsams, sweet materials | Tail, fixation, memory | Reads as laundry, or feels heavy and sweet |
| Fixative | Slow-evaporating resins and musk types | Slows the departure of everything above it | Suppresses the heart and dulls the opening |
The table is a structural guide rather than a formula. The specific materials available to a project depend on the industry standards that apply to them and on the labelling rules of the destination market, and the permitted levels are revised over time.
Why a formula smells different after it has rested
A freshly blended fragrance does not yet smell like the product it will become, and the difference is large enough that a brand should never approve a formula on the day it is made.
In the first days after blending, the reactions between materials are still settling. Some components oxidise slightly, some pairings soften, and the alcohol's own sharpness subsides as the blend becomes homogeneous at the molecular level. The overall effect is usually described as the composition becoming rounder and the ingredients less separable.
That is why a development programme evaluates a fragrance at a defined point after blending rather than immediately, and why the maceration period is part of the specification rather than a scheduling convenience. Our maceration and filtration article covers the timings and the process around them.
Where our capability fits
We evaluate a composition at three points rather than one: on blotter for structure, on skin at defined intervals for the wear, and on fabric for tenacity. The base is chosen with the fixation it provides in mind, and the maceration period is written into the specification so that the approved sample and the shipped batch are the same product.
We work with brands on private label (your brand on a proven base), OEM/ODM contract manufacturing, and full custom formula development — whichever matches where your brand is today. Our fragrance work includes perfume and fragrance manufacturing and a gardenia-led floral, and we build body care on the same three-phase brief.
Tell us what the first minute, the main body and the eight-hour tail should each feel like, and we will build the composition to that shape. Start at our inquiry page, email capsulebiotech@163.com, or message the right team on WhatsApp: Capsule Series (capsules only) +86 158-7655-5319, Cosmetics Series (serum, hair care, body care, fragrance) +86 158-7655-5319.
General manufacturing information, not regulatory or legal advice. Material restrictions, permitted levels and labelling requirements vary by market and change over time.