Perfume concentrate vs finished perfume

Three percentages, three different questions

A formula percentage asks how much of an input belongs in a blend. A stock strength asks how much material is present inside a diluted input. A finished-product loading asks how much of the blend goes into the final batch. The numbers may look similar on a label, but they answer different questions.

Write the basis beside every percentage. “20%” alone is ambiguous; “20% fragrance concentrate by mass in the finished batch” is much clearer. In these guides and calculators, percentages are by mass unless explicitly stated otherwise. Mass percentages and volume percentages are not interchangeable.

Follow one ingredient through a batch

Imagine a concentrate containing 10% of an undiluted material by mass. If you use that concentrate at 20% of the final product by mass, the final product contains 2% of that material: 0.10 × 0.20 × 100 = 2. A 100 g final batch therefore contains 20 g concentrate and 80 g other ingredients, with 2 g of the material inside the concentrate.

Now suppose the formula line was actually a 10% stock solution of the material. That same 10% line in the concentrate contributes only one tenth as much neat material. At 20% concentrate loading, the finished product contains 0.2% neat material. The stock’s solvent is part of the final mass too.

Concentrate does not always mean solvent-free

A concentrate may include solvents carried in with crystals, resins, high-impact materials or ready-made bases. It may also contain a solvent deliberately entered as its own line. Calling the mixture a concentrate does not make those solvents disappear.

Consider 6 g of undiluted material A and 4 g of material B supplied as a 10% stock. The 10 g mixture contains 6.4 g of the two aromatic materials and 3.6 g of stock solvent. Putting 2 g of this mixture into a 10 g final batch gives 20% mixture loading but 12.8% aromatic content on this simplified accounting basis.

Read a formula before you scale it

For each line, identify whether the author means the mass of the supplied stock or the mass of the undiluted aromatic. Check whether “parts” total 100, 1,000 or another number. Check whether a solvent row completes the formula and whether the final perfume dilution is a separate instruction.

If the basis is missing, label the uncertainty before weighing. A stock substitution may require increasing one row and reducing a solvent row. When there is not enough solvent allowance to make that change, the requested batch cannot be made by a simple substitution without changing its total mass or composition.

1. Confirm the total formula basis: parts, percent or grams.
2. Identify each diluted input and its solvent.
3. Calculate aromatic and solvent contributions separately.
4. Choose a finished batch size and record the intended loading.

Concentration names do not solve the calculation

Names such as eau de toilette, eau de parfum and extrait are useful product descriptions, but they do not substitute for an explicit formula. A particular name does not prove a particular mass percentage, performance or suitability for an ingredient.

Compare your trials using a written composition and actual batch masses. Increasing concentration also changes the relationship between the blend and its carrier; it is not a guaranteed route to better diffusion or a better-smelling result. Evaluate a concentration change as a new experiment.

Use the final denominator when checking a limit

IFRA explains that its quantitative ingredient restrictions are expressed for the finished consumer product. The intended product category and the current applicable documentation still need to be established. A supplier’s suggested creative use level in a concentrate is a different kind of information.

The ingredient-limit calculator can illustrate the arithmetic for a limit you supply. It cannot identify every restricted constituent in an essential oil or base, select a product category for you, or certify a finished formula. Keep the source document with the calculation so another person can understand the input.