RUŌOD Lab

Level 4 · Accord Construction

Musk Accord Workshop

Musks are the hardest materials to judge by nose, since many people barely smell some of them. Learn to blend several, test yourself and dose them safely.

Intermediate 20 min study By the RUŌOD Lab team Updated

In short

Musks are where your own nose is least reliable. Many people perceive some musks only faintly, or not at all, while finding others strong. Perfumers often blend several for that reason, and for fullness. This workshop starts by testing your own perception, because everything else about working with musks depends on it.

What you will learn

  • Test your own sensitivity to several musks
  • Explain why perfumers blend musks
  • Build a musk accord without relying on one nose

Before this lesson: Woody Accord Workshop

The families

Musk families, in outline. The musks guide explains each and its restrictions.
FamilyExamplesBench notes
PolycyclicGalaxolide, TonalideClean, laundry-like. Often sold diluted, so check the label.
MacrocyclicEthylene brassylate, Habanolide, Ambrettolide, MuscenoneFrom soft and sweet to nearly metallic
AlicyclicHelvetolideFruity, pear-like, diffusive
NitroMusk ketoneHistoric, heavily restricted. For reading about, not for buying.

The musks guide covers these in depth, and the Journal's musk article covers them from a wearer's side. Level 7's specialist track on molecular perfumery asks why such different shapes can smell alike.

Step one: test yourself

This matters more than the recipe. Prepare your musks at the same dilution, plus a solvent blank, on coded strips. Let the solvent go. Then rate each one from 0 to 5, and repeat on another day, in a different order. A material you rate 0 or 1 twice is one you must not dose by nose. Mark it in your records so you see the warning whenever you reach for it. A second person's rating is the most useful check, because they will probably disagree with you somewhere.

Step two: build a blend

  1. M1, a base musk: choose one you can smell well, with a character you like.
  2. M2, add a second from a different family, by ladder. Listen for fullness rather than simply more.
  3. M3, add a third at a lower share, ideally one that you perceive weakly and someone else perceives well. Here your helper is doing part of the evaluating, and your weight record protects you from overdosing.

How to judge a musk

  • Do it fresh. Musks fatigue the nose, and adaptation can be stubborn. Take few sniffs and long breaks.
  • Time matters. Musks are slow, so check after several hours and the next day. Some last for many days on a strip.
  • Effects count. A musk's value often shows in what it does to others. Test your blend under a simple floral or citrus accord, with and without.
  • Keep them apart. Musks cling to skin, clothes, benches and paper. A contaminated workspace will confuse your later sessions.

Check what you bought

Polycyclic musks are commonly supplied diluted in a solvent, because they are viscous or solid when pure. If your Galaxolide is sold at about 50% in another solvent, then 1 g of it is not 1 g of musk, and the rest of your arithmetic must allow for this. Read the supplier's documents, and record the actual strength.

Practical exercise: Musk sensitivity test and blend

About 75 minutes · You will have: a personal musk sensitivity table and one blended musk accord, checked by a second person

  1. Run the sensitivity test on at least three musks and a blank, twice, on separate days. If possible, ask a helper to rate them too.
  2. Make a table of your scores and your helper's. Circle any disagreement of two or more points.
  3. Build M1, M2 and M3 by weight. Have your helper smell M3 and describe it.
  4. Put your blend under a simple accord at a low share, and compare with the accord alone after 4 hours.

You have done this well if you know your blind spots, your blend's doses come from your written record and not just from your impression, and someone else has smelled the result.

Common mistakes

  • Dosing by nose alone. A musk you cannot smell can dominate for everyone else.
  • Believing the bottle is empty of smell. Check using another person before assuming it is bad.
  • Ignoring the supplied dilution. "Galaxolide" on a label is often not neat.
  • Working with musk-covered hands and sleeves. Keep it away from your clothes and hair.

Safety

Musks vary greatly in regulatory status: several nitro musks are prohibited or tightly restricted, and some polycyclics are subject to limits and environmental scrutiny. Check before you buy. Use on strips only.

Knowledge check

1. Why do perfumers often blend several musks?
Show the answer

People perceive individual musks differently, so a blend reduces the chance that someone misses it. Anosmia to particular musks is common, so a blend covers more noses. It also gives a fuller effect.

2. You cannot smell a musk at 10% on a strip. What do you conclude?
Show the answer

You may have reduced sensitivity to it, so test with another nose. Do not raise a dose on your own perception alone. Another person's check will tell you.

3. What family are ethylene brassylate and habanolide usually placed in?
Show the answer

Macrocyclic musks. Both are macrocyclic, unlike polycyclic musks such as Galaxolide.

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.