Short answer
Perfumer's alcohol is high-strength ethanol, usually denatured, used as the solvent for alcohol-based perfumes. Its job is to dissolve the fragrance, carry it off the skin and evaporate without leaving its own smell, so the grade matters: you want high strength (typically around 190 proof, 95% ethanol by volume, or anhydrous), a denaturant with as little odor as possible, and a supplier who will tell you exactly what is in it. In the US, specially denatured alcohol (SDA) is regulated by the Alcohol and Tobacco Tax and Trade Bureau (TTB), and formulas such as SDA 40-B and SDA 39-C are authorized for perfumes. Some products sold as "perfumer's alcohol" also contain additives — ask before you formulate with one.
Why ethanol, and why denatured
Ethanol dissolves almost every fragrance material, evaporates quickly at skin temperature, is relatively low in odor once purified, and is tolerated on the skin. Other alcohols do not do the job: isopropyl alcohol (rubbing alcohol) has a strong, sharp odor of its own and is not used for fine fragrance.
Undenatured ethanol is taxed as a beverage alcohol in most countries. Denaturing it — adding small amounts of substances that make it undrinkable — allows it to be sold for industrial and cosmetic use without beverage tax. The denaturant is the part that matters to a perfumer, because some have an odor and some are things a brand may prefer not to use.
Grades you will meet
| Name | What it is | Notes |
|---|---|---|
| SDA 40-B | Ethanol denatured with small amounts of tert-butyl alcohol and denatonium benzoate (a bitter agent), per suppliers' specifications | Widely used for perfume; the denaturants have little odor at their levels |
| SDA 39-C | Ethanol denatured with diethyl phthalate (DEP) | A general-use formula for perfume articles; some brands avoid phthalates as a policy |
| 190 proof vs 200 proof | About 95% ethanol by volume vs anhydrous | 190 proof contains roughly 7–8% water by weight; it matters if you add water |
| Undenatured (tax-paid) ethanol | Pure ethanol on which beverage tax has been paid | Expensive; mainly used where denaturants must be avoided |
| "Perfumer's alcohol" blends | Retail products, often based on SDA, sometimes with added ingredients | Ask what has been added — some contain glycols, esters or other modifiers |
TTB's regulations list the uses each SDA formula is authorized for; perfumes and perfume tinctures are among the authorized uses of several formulas, including 39-C and 40-B (27 CFR 21.141). SDA 39-C's general-use formula for articles also requires a minimum amount of perfume material per gallon of finished product. If you buy SDA in quantity, or make products with it beyond retail-scale purchases, read TTB's guidance on permits and approved formulas or ask your supplier; the rules depend on how you obtain and use the alcohol. Outside the US, denatured alcohol is regulated nationally — in the UK, for example, by HMRC — with its own permitted formulations.
What to ask a supplier
- Which denatured formula is it, and what are the denaturants?
- What is its strength — by volume and, ideally, by weight — and its water content?
- Has anything else been added (fixatives, glycols, esters, "conditioning" agents)?
- A specification and a certificate of analysis for the lot, and a safety data sheet.
- Is the source grain, cane or synthetic? (It matters for some brand claims, and some perfumers find small odor differences.)
File the answers like any material's documents; see fragrance material SDS and specifications.
Checking the alcohol yourself
- Odor. Dip a blotter and smell it as it dries; a good perfumery grade leaves almost nothing behind. Compare lots side by side.
- Clarity. It should be water-clear.
- Density, if you want to confirm strength and you have a flask: see how to measure density.
Water, strength and labeling
The water already in 190-proof alcohol counts if you add more water to a perfume; the calculation is in adding water to perfume. On ingredient lists, denatured alcohol is commonly declared as "SD Alcohol" with its formula number in the US, and as "Alcohol Denat." under the INCI names used in the EU; see perfume ingredient labeling. Some denaturants may also need to be considered in labeling and safety assessment.
Storage and safety
Perfumer's alcohol is a highly flammable liquid. Store it in closed containers suited to flammable liquids, away from ignition sources, in a ventilated place, and keep only working quantities at the bench. Close bottles promptly: open alcohol evaporates, absorbs water from the air and picks up odors. The practical rules are in perfume lab safety.
Records
Treat the alcohol as a raw material with a full record: grade, denaturants, supplier, lot, strength and documents. It is usually the largest ingredient in the bottle, and a change of grade or supplier can change the perfume. The fields worth keeping for any material are in perfume raw material documentation.
Sources
- US Alcohol and Tobacco Tax and Trade Bureau — SDA 39-C (27 CFR § 20.122), checked October 9, 2026.
- Electronic Code of Federal Regulations — 27 CFR § 21.141, Index of products and processes, checked October 9, 2026.
Frequently asked questions
Can I make perfume with vodka?
Vodka is around 40% ethanol, so it is mostly water. Many fragrance materials will not dissolve properly, and the perfume is likely to cloud. Use high-strength perfumery alcohol.
Is 200 proof better than 190 proof?
Not necessarily. Anhydrous alcohol dissolves slightly more and contains no water, but most perfumes are made with 190 proof. Consistency matters more than the choice: use the same grade every time and record it.
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.