Each oil evaporates at its own pace. The light fraction leaves a blotter within hours; the heavy fraction stays for days. The table places the 57 oils Lê Mai sells into the three usual perfumery classes: top, heart, base.
The hours column uses the substantivity figure published by The Good Scents Company: the hours an odour stays recognisable on a blotter at 100 percent. Cells without a figure are estimates based on main constituents and common practice.
| Oil | Class | Blotter | Notes |
|---|
Class. Top is what is noticed on opening and fades within hours. Heart gives a blend its character. Base lasts longest, usually woods, resins, balsams. Many oils sit between two classes; the chart shows those as "Top → Heart".
Hours. The time an odour stays recognisable on a blotter at 100 percent, as published by The Good Scents Company. 400 hours is the ceiling of that source and is shown as "≥ 400". Bars use a log scale so small values stay readable.
Estimate. A dashed bar and the label "estimate" mean the source gives no hours for this oil. The class then follows main constituents and common use. Notes say when a figure comes from a close material rather than the exact grade Lê Mai sells.
Limits. Blotter hours are not wear time on skin, in soap or in candles. Temperature, dilution, lot and the nose all shift the figure. The chart supports relative comparison, not precise prediction.
Pick oils by class in the Pyramid builder. Convert a formula to grams, ml and drops in the Formula calculator. Dermal limits sit on Safety and on each oil page.
Data retrieved 27 September 2026.