Top, heart and base notes are the three stages a perfume moves through as it evaporates on your skin: the bright first impression, the main character, and the warm trail that lingers for hours. They exist because every perfume is a blend of ingredients that evaporate at very different speeds.
Quick answer: Top notes are the lightest, most volatile ingredients you smell in the first minutes; heart (or middle) notes take over as the opening fades and carry the perfume's main theme; base notes are the heaviest, slowest-evaporating materials that stay on skin longest. The so-called fragrance pyramid is simply a map of that evaporation, from fastest to slowest.
What are perfume notes?
A note is a perfumer's word for a distinct smell you can pick out in a fragrance — lemon, rose, sandalwood. Some notes are single ingredients; others are accords, meaning several materials blended to suggest one impression, such as "sea spray" or "amber."
The note list on a box is a description, not an ingredient label. It tells you what you are likely to smell and roughly when, which is why brands group notes into top, heart and base.
Why do perfumes have top, middle and base notes?
It comes down to volatility — how readily a material evaporates. A perfume is a mix of odorous materials "with different volatilities," and the property that describes how long a material lasts on skin is called substantivity or tenacity (Zarzo, Sensors, 2013).
That same paper describes the classic structure clearly: the top note is "the first odor perceived," usually the most volatile part of the composition; middle notes are "the main body of a blend," perceived after the top fades; and base notes are "fixative materials with a very low volatility and great substantivity." In 1955, W.A. Poucher even ranked 332 materials on a 1-to-100 scale by how long they lasted on paper smelling strips (described in the same study).
Perfumers use this deliberately. Instead of a scent that is loud for ten minutes and then gone, the pyramid lets a fragrance unfold in stages, with each layer handing over to the next.
What are top notes? The first impression
Top notes (the French call them notes de tête, "head notes") are what jumps out of the bottle and the first thing you smell on a tester strip. They are typically citrus peels, light herbs, fruits and airy spices.
There is a reason so many openings smell "fresh." The Zarzo study found a strong link between how fresh a material smells and how quickly it disappears: citrus and green notes read as fresh and evaporate fast, while amber, powdery and animalic materials are the tenacious ones. Freshness, in other words, is usually fleeting by nature.
A good example is Bon Parfumeur 801 Blu Palermo, which the house lists as opening on lemon, mandarin and grapefruit — a textbook bright, zesty top.
What are heart notes? The main character
Heart notes, also called middle notes, appear as the opening fades and form the core of the perfume — the part you will actually live with for much of the wear. Florals, spices, teas and rounder aromatic materials often sit here.
In 801 Blu Palermo, the heart shifts to a sea-spray accord, rosemary and pink berry, so the citrus sparkle turns salty and herbal. In BDK Gris Charnel, the brand lists fig, black tea and cardamom up top, then a heart of iris absolute and Bourbon vetiver — the scent moves from spiced fig and tea to something powdery and earthy.
What are base notes? The long goodbye
Base notes are the heaviest, slowest-evaporating materials: woods, resins, vanilla, tonka bean, patchouli and musks. They are the "fixatives" of the formula, meaning they help anchor lighter materials and give the perfume its lasting trail.
Gris Charnel dries down to Indian sandalwood and tonka bean absolute. BDK Velvet Tonka is built almost entirely toward its base — orange blossom and almond on top, rose and tobacco in the heart, then tonka bean, Madagascan vanilla, amyris wood and amber woods at the bottom — which is why it leans warm and enveloping.
How does a perfume change on your skin, stage by stage?
The clearest way to understand the pyramid is to follow one perfume through a day. Take BDK Villa Neroli, whose published notes make each stage easy to picture:
| Stage | When you notice it | Villa Neroli (per BDK) | What it feels like |
|---|---|---|---|
| Top | The first minutes | Verdelli lemon, neroli, petitgrain | Sunny, sharp, green citrus |
| Heart | After the opening settles | Orange blossom absolute, rose absolute | Soft, sweet-floral, luminous |
| Base | Hours later, close to skin | Vanilla absolute, vetiver, patchouli, labdanum | Warm, resinous, gently woody |
One important nuance: the three stages overlap. Base materials are on your skin from the very first spray — they are simply drowned out by the louder, faster top notes at first. What changes over time is the balance, not a switch from one liquid to another.
Why does the same perfume develop differently on different people?
Evaporation is not only about the perfume. Researchers at Firmenich measured perfume ingredients rising off volunteers' forearms and found each odorant diffused from skin at its own rate — and that the same materials evaporated more slowly when applied from soap than from an alcohol-based perfume (Vuilleumier et al., International Journal of Cosmetic Science, 1995). How a scent is applied changes how it unfolds.
More recently, a team at Université Le Havre Normandie measured fragrance evaporation on the skin of several volunteers to examine how skin properties and the molecules' own characteristics together shape evaporation rates (Hadjiefstathiou et al., International Journal of Cosmetic Science, 2025). The takeaway for shoppers is practical: the pyramid on the box is a guide, and your skin writes the final draft.
How to use notes when choosing a perfume
- Do not decide in the first minute. The top notes are the most short-lived part of the scent. Let it settle before judging.
- Read the base notes first. They describe what you will smell for most of the day. If you love the opening but dislike the base, the romance will not last.
- Test on skin, then walk away. Smell again later to meet the heart and the dry-down (the final, settled stage of a perfume).
- Follow a note you love. If a tonka-rich base keeps winning you over, browsing our tonka bean or neroli collections is a faster route than guessing from names.
The best way to learn the pyramid is to smell it happen. Try a citrus-led opening beside a warm, base-heavy scent, and you will notice the difference within minutes — you can smell them side by side at our Somerville boutique, or explore the full BDK Parfums line, whose published notes lay out each stage in detail.
Frequently asked questions
What are top, middle and base notes in perfume?
They are the three stages you smell as a perfume evaporates. Top notes are the lightest, fastest-evaporating materials you notice first; heart (middle) notes form the main character once the opening fades; base notes are the heaviest, slowest materials that linger longest. The three tiers describe speed of evaporation, not three separate liquids.
How long do top notes last?
Top notes are the shortest-lived part of a perfume, dominating mainly the first minutes after you spray. How quickly they fade depends on the ingredients, how much you apply, and your skin and surroundings. Bright citrus openings tend to be the most fleeting.
Which notes do you smell first in a perfume?
You smell the top notes first, because they are the most volatile materials in the formula and reach your nose fastest. Citrus, light herbs and some airy spices are classic top notes. The heart and base are present from the start too, but the top notes dominate the first impression.
Are base notes the longest-lasting part of a perfume?
Yes. Base notes are built from low-volatility materials such as woods, resins, vanilla, tonka and musks, which evaporate slowly and stay on skin longest. They are what you still smell on a sweater or wrist hours later, and they anchor the lighter notes above them.
Why does a perfume smell different after an hour?
Because the fastest-evaporating molecules have largely gone and the slower ones now dominate. A perfume that opens with sparkling lemon can settle into orange blossom and finish on vanilla and woods. This evolution is intentional and is why you should judge a perfume after it has had time to develop.
Should I buy a perfume based on how it smells right away?
It is better not to. The opening is the most short-lived stage, and the heart and base are what you will live with for most of the day. Spray a tester on skin or a blotter, walk around, and smell it again later before deciding.
Do all perfumes have top, heart and base notes?
Every perfume evaporates in stages, but not every perfume changes dramatically. Some are composed to smell fairly similar from start to finish, and brand note lists are simplified descriptions rather than full ingredient lists. The pyramid is a helpful map, not a strict rule.