How to balance top, heart and base notes

Start with roughly a third of the concentrate in top notes, half in the heart and a fifth in the base, then let the strip correct you. The shares are a starting point; what decides whether a perfume feels balanced is how long each material actually stays readable, and that is a fact about the material, not about the tier a chart filed it under.

What is the usual ratio of top, heart and base notes?

The figures passed around are somewhere near 20 to 30 percent top, 40 to 50 percent heart and 20 to 30 percent base, by mass of the concentrate. They are conventions, not chemistry. A citrus cologne can run half top notes and be right. An amber can run half base and be right. The split tells you where to put the first weights so that the opening, the middle hours and the drydown all have something to say. It does not tell you the perfume is balanced when the numbers land.

Two things make the shares lie. Materials differ enormously in strength, so 10 percent of a quiet material and 10 percent of a loud one are not the same 10 percent. And materials differ in how long they last, which is the real subject.

Which tier does a material belong to?

The marketing pyramid files materials by the kind of smell they have: citrus is top, flowers are heart, woods are base. The strip files them by the hours they last. When the two disagree, the strip wins, because the strip is what the wearer gets.

Hedione is the standard example. It smells like a heart note, a transparent jasmine, and it lasts on a blotter well into base-note hours. Iso E Super is another: filed as a wood, faint on a fresh strip, and still there the next day. Neither behaves like the tier its odour suggests, and a formula that dosed them by the pyramid rather than by the clock ends up with a heart that never leaves and a base that arrives before the opening has gone.

So the working rule is: read the substantivity figure, the hours a material stays readable on a strip, and file it by that. The odour family tells you what a material says. The hours tell you when.

Why does the opening disappear too fast?

Because top notes are mostly small molecules, they leave quickly, and a top share that looks generous on paper is gone in twenty minutes if nothing bridges it into the heart. The fix is rarely more top note. It is a material that lives in the gap between the opening and the middle: something that reads at minute ten and is still reading at hour one. Linalool does this in many florals, geraniol in roses, and a small dose of a long-lasting citrus effect in colognes. Bridging is the job most beginner formulas leave unfilled.

Why does the base take over?

Base materials are usually strong and always long-lasting, so a 20 percent base share of a strong material can be louder at hour two than the whole heart. If the drydown arrives early and flattens everything, the answer is not to cut the base tier as a block. Find the one line that is doing it, usually the strongest one, and halve it. Ambroxan at 2 percent and at 0.5 percent are two different perfumes, and only one of them lets the heart be heard.

A worked skeleton

A simple woody citrus, written in parts of the concentrate, with the tier assigned by strip life rather than by name:

• Opening, about 30 parts: bergamot essential oil 22, pink pepper essential oil 8. Both leave the strip within the first hour or two.
• Bridge and heart, about 45 parts: linalool 12, hedione 30, geraniol 3. Hedione is dosed high because it is quiet, and it is here rather than in the base because its job is to carry the middle hours, whatever the strip says about its tail.
• Base, about 25 parts: Iso E Super 15, Virginia cedarwood 8, ambroxan 2. Ambroxan is the smallest line in the formula and will still be the last thing left.

Put it on a strip, date it, and read it at ten minutes, one hour, four hours and the next morning. If the bergamot is gone before the hedione has bloomed, raise the linalool. If the ambroxan is the whole story by hour four, halve it before touching anything else. Move one line at a time and keep the version that worked.

PerfuMate does the reading for you before the strip does. Every material on your shelf carries a strip-life figure, and the scent profile draws the formula over 0 to 24 hours in perceived impact, so a base that will drown the heart shows up in the chart before it shows up on skin. AI Studio composes only from the materials you own, handed your shelf and the catalog on every run and never trained on them.