Does Order Change the Result? The Short Answer and the Long Answer
The short answer: the chemical composition of the finished blend does not depend on the order in which the raw materials were added. Whatever order you put ten raw materials in, a week later the same molecules are in the bottle at the same ratios.
The long answer: order changes how accurately and with how little loss you reach that point. A solid that does not dissolve, a volatile that escapes, a resin left at the bottom, a mistaken weighing; all of these are order problems, and in the end the composition in the bottle deviates from the formula you designed.
So the order of addition is not a rule of chemistry but a working discipline. The right order makes the formula in the bottle the same as the formula on paper.
The Four Principles That Set the Order
The practical order derives from four principles; behind each one stands a concrete mistake.
Solvent first, then solute. Solid and viscous materials are added when the liquid they will go into is ready. Vanillin put into an empty bottle cakes; vanillin added on top of DPG or liquid raw materials dissolves.
Volatiles last. Fast-evaporating raw materials such as citrus oils, aldehydes and cis-3-hexenol are added at the end of blending, not at the beginning when the bottle stays open the longest. In a long weighing session, part of the bergamot added first evaporates before the formula is even finished.
Large first, small later. High-ratio raw materials are weighed first; trace doses, from prepared dilutions, are added after the body is built. A small dose is more likely to cling to the wall of an empty bottle and be lost than to fall into a full one.
No alcohol until the concentrate is finished. The fragrance concentrate is first made homogeneous in itself, then taken into alcohol. Adding the concentrate to alcohol raw material by raw material hides ratio errors and reveals solubility problems late.
The Practical Order of Addition: Step by Step
This is the order that works for an alcohol-based perfume concentrate. In other products the principles are the same and the materials differ.
- Solvents and the dilution base
Weigh the solvents in the formula, such as DPG, benzyl benzoate and IPM, and the carriers of the diluted raw materials. This is the ground in which the solids will dissolve.
- Solids and resins
Crystals such as vanillin, coumarin and ethyl maltol (preferably from a ready stock solution) and warmed resins. Do not proceed until fully dissolved.
- Base notes and musks
Heavy, slow-evaporating raw materials: musks, woody molecules, ambergris-type materials, the sandalwood accord. These do not evaporate; they are weighed at leisure.
- Heart notes
The floral and spicy body. Hedione, linalool, geraniol, ionones, clove and cinnamon derivatives.
- Trace materials
From dilutions, carefully: indole, damascone, pyrazines, sulphur molecules. Because the body is ready, they do not cling and get lost.
- Top notes
Citrus, aldehydes and green notes last. Cap the bottle as soon as weighing is finished.
- Homogenise, rest, then alcohol
Mix the concentrate thoroughly and let it stand at least overnight. Then take it into alcohol; if there is water, add it last and slowly, while stirring.
Special Cases: Water, Heat and Reactions
Some materials add extra rules to the order.
Water. In alcohol-based perfume, water is added after the concentrate has fully mixed into the alcohol, and little by little. Adding water before the alcohol or too fast creates a locally high water ratio and the fragrance oil clouds (louching). The clouding sometimes reverses, sometimes not.
Heated material. Resins and some absolutes are warmed to make them fluid. Pouring hot resin over volatile notes drives off the volatiles; hot material is added first, volatiles afterwards, and the blend is bottled once it has returned to room temperature.
Reactive pairs. Aldehyde + amine (Schiff base, colour and odour change), some aldehydes forming acetals in alcohol, acidic raw materials slowly hydrolysing esters. These depend not on order but on formula design and maceration time: the change is expected, planned for and followed in stability testing.
Candle and oil-based products. The fragrance oil is added to the molten wax at the temperature recommended by the wax manufacturer and in one go; here the order is a matter not of raw materials but of temperature and stirring time.
Frequently Asked Questions
The most common questions about mixing order.
I added in the wrong order; should I throw the formula away?
Couldn't I put the alcohol in first and add the raw materials into it?
Why do we add the top notes last?
Why do we add the water slowly?
Does the order of addition change how the scent develops?
Does adding solids as stock solutions solve the order problem?
Why is it important to use the same order in every batch?
Can I pre-group raw materials in production?
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