Short answer
Perfume-making kits and workshops let people blend their own perfume, which means the person mixing is not a perfumer and the safety margin has to be built into what you give them. IFRA's guidance places the ingredients of perfume kits in Category 4, the fine-fragrance category, so each material should be supplied at a dilution that keeps any blend a participant can make within Category 4 limits. Kit bottles are chemical products for labeling purposes, children's kits fall under toy-safety rules, and a workshop that sends people home with a perfume is handing over a cosmetic. Record what each participant made so it can be remade — or traced if someone reacts.
Why kits are different
In your own lab you check a formula before anyone wears it. In a kit or a workshop, the formula is invented on the spot by someone who cannot run a restriction check. The safe design therefore moves the check upstream: you choose the materials and their dilutions so that no plausible combination exceeds the limits. IFRA's alphabetical table lists "ingredients of perfume kits and fragrance mixtures for cosmetic kits" in Category 4 — the materials are judged as if they will end up in a fine fragrance on skin (IFRA Standards explained).
Designing the materials
- Choose forgiving materials. Prefer well-documented materials and accords with generous Category 4 limits; leave out prohibited and tightly restricted ones, and strong sensitizers.
- Pre-dilute. Supply each material already diluted — typically in perfumer's alcohol for spray kits, or a carrier oil for oil kits — at a strength where even the worst case passes.
- Check the worst case. For each restricted material, assume a participant uses only that bottle at the maximum proportion your instructions allow, at the finished strength. If that passes, every mix does (how to check IFRA limits).
- Mind phototoxic citrus. Supply furocoumarin-free grades; combinations of expressed citrus oils add up (IFRA phototoxicity calculations).
- Give a simple recipe card in parts by weight or by measured volume, not drops (why drops are unreliable).
A worked example of the worst-case check: a kit bottle holds a material at 0.50% in alcohol, and its invented Category 4 limit is 0.60%. A participant who fills the whole bottle of their perfume with it reaches 0.50% — under the limit — so no mixture of kit bottles can exceed it for that material. If the limit were 0.30%, the bottle would need to be diluted further.
Labels and packaging
- Kit bottles of fragrance materials sold to consumers are chemical mixtures: in the EU and GB they are classified and labeled under CLP, which can require hazard pictograms, child-resistant closures and tactile warnings; in the US, hazardous household products are labeled under the Federal Hazardous Substances Act. See REACH and CLP for fragrance oils and labeling candles, diffusers and room sprays.
- Children's kits are toys: toy-safety law, in the EU with specific rules for cosmetic kits and olfactory games, restricts fragrance allergens and requires age warnings. IFRA's guidance places children's toys in Category 1 and olfactive board games in Category 12. Design children's products only with specialist advice.
- Alcohol in kits is flammable; transport and storage rules apply (perfume flash point).
Running a workshop
- Pre-diluted materials, checked as above; no neat aroma chemicals on the table.
- Ventilation, no open flames, spill kit, gloves available; alcohol in small containers (perfume lab safety).
- Blotters for smelling; skin testing only with the finished, checked blend.
- Scales or graduated pipettes so participants record amounts, not drops.
- A record card per participant: date, materials and amounts, batch codes of the kit bottles, finished strength.
- A label for each take-home bottle with the participant's blend name, date, ingredients and allergens as your market requires, and your contact details.
A workshop perfume is made for one person; the record-keeping is the same as for bespoke work (bespoke perfume client records). Whether product law treats a workshop blend as a cosmetic you supply depends on the market and the arrangement; take advice if you run workshops commercially.
Records
Keep each kit material as a formula or dilution with a version and its worst-case check, the lot of each bottle filled, and the participant records. A where-used search then tells you which kits and blends contain a material if a rule changes (find formulas using a material). Kits and workshops are a business line with their own costing; see the fragrance development workflow and how to price a perfume. For the consumer's side of trying scents, the RUŌOD Journal has perfume samples and decants.
Sources
- IFRA — Guidance for the use of the IFRA Standards, Table 12 (ingredients of perfume kits: Category 4; children's toys: 1; olfactive board games: 12); checked October 11, 2026.
Frequently asked questions
Can I put neat essential oils in a perfume-making kit?
It is safer not to. Neat oils let a participant exceed limits and handle sensitizers undiluted; supply them pre-diluted at strengths checked for the worst case.
Do workshop participants own their formulas?
Agree it up front. Many workshops give the participant the recipe card and keep a record so they can reorder.
Are kits for children allowed?
Yes, under toy-safety rules that are stricter than cosmetics rules for fragrance. Do not adapt an adult kit for children without specialist advice.
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.