Training Your Nose: The Art of Evaluating Raw Materials

Smell with a purpose

Perfumers do more than decide whether a material smells pleasant. They learn to recognize its character, intensity, development, and behavior over time. The skill is built through consistent observation—not by trying to memorize hundreds of odor descriptions at once.

A good evaluation begins with a simple question: what does this material do on its own, before it becomes part of a formula?

Prepare a consistent evaluation

Work in a well-ventilated, low-odor space, away from perfume, cleaning products, and food aromas. Use clean, labeled smelling strips and a notebook. Avoid applying unfamiliar raw materials directly to skin.

Evaluate each material at a suitable, known dilution in an appropriate solvent, following its safety documentation and handling guidance. A single dilution does not suit every material: extremely potent odorants may require much lower concentrations, while other materials are easier to assess at higher ones. Record the concentration and solvent every time.

Dip the narrow end of a strip into the evaluation solution, allow excess liquid to drain, and keep the strip from touching other samples. Smell gently at a comfortable distance rather than pressing it against your nose.

Observe the material over time

Start with a brief first impression. Is it citrusy, floral, woody, musky, green, spicy, or something harder to categorize? Then move beyond labels. Is the impression sharp or soft, dry or sweet, transparent or dense, smooth or rough?

Return to the same strip after approximately 15 minutes, one hour, and several hours, when appropriate. Some materials change noticeably as more volatile components evaporate. Others seem relatively stable but become easier to understand after the initial intensity fades.

Do not assume a material has disappeared just because you can no longer smell it. Your nose may have adapted. Put the strip aside, take a break, and return with fresh attention.

Understand olfactory adaptation

Repeated or prolonged exposure to an odor can temporarily reduce your sensitivity to it. This is olfactory adaptation, and it can make a powerful material seem deceptively weak. Some musks and woody-amber materials are especially challenging to judge because sensitivity varies between people.

Keep sessions short. Compare only a few materials at a time, step into clean air between rounds, and resist the temptation to sniff repeatedly until you 'get' a note. Coffee beans are not a reliable reset button; time and a neutral environment are more useful.

Build your own odor vocabulary

Supplier descriptions are useful references, but your own language should come first. Write down the associations you actually perceive—even if they are unusual. 'Dry pencil shavings,' 'cool linen,' or 'green tomato stem' may help you recall a material more effectively than a generic label.

Over time, compare your notes with technical descriptions and with related materials. The goal is not to produce the most elaborate vocabulary; it is to build a consistent mental reference library that improves formulation decisions.

A trained nose is not necessarily one that identifies everything instantly. It's one that notices, records, compares, and keeps learning.