The Science of Fragrance Notes: Top, Heart, and Base

## Why Fragrances Change Over Time A fragrance is not a static smell. It is a composition that evolves — sometimes over minutes, sometimes over hours — as different molecules evaporate at different rates. This is the note structure: top, heart, and base. ## Top Notes **Duration:** 5–30 minutes after application Top notes are the first impression — the opening statement. They are composed of small, light molecules that evaporate quickly. Typical top notes: citrus (bergamot, lemon, neroli), light herbs (basil, ginger), green notes (violet leaf, galbanum). The paradox of top notes: they are what you smell first in a store, but they are the least representative of the fragrance as a whole. Never buy a fragrance based on the first five minutes. ## Heart Notes **Duration:** 30 minutes – 4 hours The heart is the soul of the fragrance. These are larger molecules that take longer to emerge but form the dominant character of the scent during its longest phase. Typical heart notes: rose, jasmine, iris, lavender, spices, orris, ylang-ylang. This is the fragrance you are actually buying. ## Base Notes **Duration:** 4 hours onwards Base notes are the heaviest molecules — the foundation the entire composition rests on. They emerge last and linger longest, often remaining on skin and fabric for 12–24 hours. Typical base notes: sandalwood, cedarwood, oud, vetiver, benzoin, labdanum, musks, vanilla, amber. The base is what people smell on your skin hours after you applied the fragrance. It is the final impression. ## The Perfumer's Craft Composing a fragrance means balancing all three levels so each acts interacts harmoniously with the others — and the transition between them feels seamless rather than jarring. This is extraordinarily difficult. A well-composed fragrance is one of the most technically complex creative achievements there is.