RUŌOD Lab

Level 9 · Modern and Experimental Perfumery

Overdose Technique: Study Guide

Read our guide to overdosing a material, then push one material past its usual share in a small formula and record what breaks and what comes alive.

Advanced 15 min study By the RUŌOD Lab team Updated

In short

An overdose uses a material at a share far above its usual one, on purpose, so that it stops being a contributor and becomes the structure of the fragrance. The reference guide covers the idea and its famous forms. This study guide has you push a material past its normal share in a small formula and find out what really happens.

What you will learn

  • Say what makes an overdose different from an error
  • Ladder one material well past its usual share

Before this lesson: High-Impact Aroma Chemicals

What to look for as you read

  • Which kinds of material can carry an overdose, and which cannot.
  • What must change around the overdosed material.
  • The checks to make before you start, particularly restriction limits.

Practical exercise: An overdose ladder

About 60 minutes · You will have: a four-step ladder with one material from its usual share to a deliberate excess

  1. Choose a low-risk, clean material with room to rise: a Hedione-type or a musk is a common choice. Check for any restriction.
  2. Take a small formula you know, and find the material's share in it.
  3. Make four versions at about 1×, 2×, 4× and 8× of that share, keeping the rest in the same ratio to each other, so that the total stays 100%.
  4. Compare them at 15 minutes, 2 hours and 8 hours. Note where the character changed, and where it fell apart.
  5. Write one change that would improve the highest version you liked.

You have done this well if your arithmetic adds to 100% at every step, and you can name the step where the fragrance stopped being the original idea.

Knowledge check

1. What separates an overdose from a mistake?
Show the answer

It is deliberate, tested and kept within any limit that applies. Share alone does not make it a technique. The result and the checks do.

2. Before planning an overdose, what should you check first?
Show the answer

Whether a restriction limits that material. Many materials cannot legally or safely go that high in a skin product.

3. Do you need to rebalance the rest of the formula?
Show the answer

Usually, since the other materials now play a different part. The total is still 100%, so everything else shrinks in share as the overdosed material grows.

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.