RUŌOD Lab

Level 6 · Complete Perfume Creation

Maceration: Study Guide and Side-by-Side Test

Read our maceration guide, then test it for yourself: compare a fresh dilution with one aged for weeks, blind, to see whether your formula actually changes.

Intermediate 15 min study By the RUŌOD Lab team Updated

In short

Maceration means resting a fragrance after blending or dilution, and perfumers commonly report that formulas settle with time. The reference guide explains the practice and what is thought to be happening. Instead of taking anyone's word for it, this study guide has you test it on one of your own formulas.

What you will learn

  • Run a controlled comparison of fresh and rested dilutions
  • Report what you can and cannot conclude from one test

Before this lesson: When Is a Perfume Formula Finished?

What to look for as you read

  • What the guide says could change during rest, and which of those would be perceptible.
  • The usual recommendations on time, temperature and light, and how much these are conventions.

Practical exercise: Fresh versus rested, blind

About 30 minutes · You will have: a blind comparison of one formula's fresh and rested dilutions

  1. Dilute part of a composition today. Store it sealed, dark and cool for four weeks or more. Label it clearly.
  2. On test day, dilute a fresh sample from the same concentrate, at the same strength. Note that the concentrate has aged meanwhile, which limits the test.
  3. Have a helper code them, or shuffle them yourself.
  4. Run six blind triangle trials at a few minutes after dipping, and note any difference at 1 hour.
  5. Write what you found, including the limits.

You have done this well if you report your score against the chance level, and say what this test could not show.

Knowledge check

1. How do you make the comparison fair?
Show the answer

Make the fresh sample on test day from the same concentrate, and test blind. A fresh batch made at the time gives a real control. Memory is not one.

2. What might change as a dilution rests?
Show the answer

Reactions between materials may develop, and harshness may seem to reduce. Reactions such as Schiff base formation can occur, but the size of perceptible effects varies by formula.

3. Your test showed no difference. What can you say?
Show the answer

You could not detect one in this test, at these times. One null result limits what you can say about this formula and this test only.

Further reading and materials

Written and reviewed by the RUŌOD Lab team. This is general education, not legal, regulatory, medical or safety advice. Example dilutions and exercises are for learning, are not validated products, and have not been safety-assessed. Completing a lesson confers no qualification. How we check these lessons.