Short answer
The damascones — alpha-, beta- and delta-damascone — and the closely related damascenone are the "rose ketones": molecules found in trace amounts in rose oil that give it a fruity, plummy, apple-and-tobacco depth out of all proportion to their quantity. Perfumers use them in traces, always from a dilution, to make rose accords realistic and to add a jammy richness to fruity, tobacco and oriental formulas. They are among the most powerful materials in common use, restricted in IFRA and EU rules, and in the EU they must be declared on labels as "Rose Ketones" above the allergen thresholds.
The materials
| Material | Odor | Typical use |
|---|---|---|
| Beta-damascone | Fruity, plum, blackcurrant, rose, tobacco | The most used: depth in rose, fruit and tobacco accords |
| Alpha-damascone | Fruity, apple, rosy, slightly green | Brighter, fresher fruit-rose effects |
| Delta-damascone | Fruity, rosy, slightly minty-green | Fruit and floral notes; a common component of fruity bases |
| Damascenone | Cooked fruit, plum, rose, honey | Extremely powerful; traces for rose realism and boozy-fruity warmth |
The isomers are not interchangeable; each has its own character. Damascenone in particular has one of the lowest odor thresholds among perfume materials — a reminder that a material's effect has little to do with its percentage (odor threshold).
Working with them
- Always dilute. Keep a 1% and a 0.1% stock in ethanol or DPG and weigh those, never the neat material, for trials. The arithmetic for counting the active amount is in how to dilute aroma chemicals.
- Dose in steps. Add in tiny steps and smell after the trial has rested; the effect builds over a day.
- Watch contamination. Damascones linger on pipettes, bottle necks and skin; a trace in the wrong trial changes it (preventing cross-contamination).
- They are long-lasting for their size and can dominate a drydown with a jammy note if overdone.
Where they belong
- Rose accords — the damascones are what separates a convincing rose from a soapy one (how to make a rose accord).
- Fruity accords — plum, blackcurrant, apple and dried fruit (fruity notes).
- Tobacco, rum and boozy notes, with coumarin and honeyed materials (the honey accord).
- Osmanthus and other fruity florals, with ionones (the osmanthus accord).
Restrictions and labeling
- EU. The rose ketones — alpha-, beta- and delta-damascone and related isomers — share an entry in Annex III of the Cosmetics Regulation, which sets a maximum concentration of 0.02% in products other than oral products. Regulation (EU) 2023/1545 added that their presence must be indicated as "Rose Ketones" in the ingredient list above 0.001% in leave-on and 0.01% in rinse-off products.
- IFRA. The rose ketones are covered by an IFRA Standard; check the current limits for your product category (how to check IFRA limits).
- Naturals count. Rose oil and some other naturals contain damascones and damascenone; their contribution counts toward the same limits where the rules say so.
Because the limits are low and the materials so strong, a small weighing error matters; see batch weighing tolerance.
A study exercise
Make a simple rose base of phenylethyl alcohol, citronellol and geraniol. Split it into four and add, at 0.05% of the base (from a 1% dilution), beta-damascone, alpha-damascone, delta-damascone and nothing. Smell blind after a day: the differences in fruit, freshness and depth are the clearest lesson in what trace materials do.
Records
Record each isomer separately, its dilutions as linked records with their strength, and its regulatory status. The materials' place in the floral and fruity palette is mapped in the guide to perfume materials by odor family. For the wearer's view of rose, the RUŌOD Journal has rose in perfume.
Sources
- EUR-Lex — Regulation (EU) 2023/1545, Annex, entry 157 (rose ketones); read October 11, 2026.
Frequently asked questions
How much damascone goes in a perfume?
Traces, within the limits for the product category. Effective amounts are often small fractions of a percent of the concentrate, and the legal and IFRA maximums are low.
Why does my rose smell like jam?
Too much beta-damascone or damascenone. Halve it and let the trial rest a day before judging.
Are damascones natural?
They occur in nature, notably in rose, but the materials perfumers buy are almost always synthetic.
Written and reviewed by the RUŌOD Lab team. This article is general education about perfume formulation and record-keeping; it is not legal, regulatory or safety advice, and the examples are illustrations, not validated commercial formulas. How we write and check these guides.