A perfumer’s palette usually holds a few hundred materials: essential oils, absolutes and resinoids from plants, and aroma chemicals made by chemists. Modern fine fragrance typically uses far more synthetics than naturals by weight. That is not a compromise: molecules give consistency from batch to batch, make some scents possible for the first time, and protect endangered species and crops.
You will learn how each type of material is produced, how to smell it critically, and how to record what matters to a perfumer: family, volatility, strength, price band and regulation.
By the end you will be able to
- Explain steam distillation, cold pressing, solvent extraction (concrete and absolute), CO₂ extraction and tinctures
- Recognise the main molecule groups: aldehydes, esters, lactones, terpenes and musks
- Understand why IFRA Standards and EU allergen labelling exist and how they affect a formula
- Keep a palette sheet you will use for every later masterclass
Your kit
- About 36 materials at 10% dilution (listed by week; add your own favourites)
- Smelling strips, labels, notebook or spreadsheet
- A digital scale reading to 0.01 g (needed from Masterclass 03)
Week 1 · One tree, three smells: extraction methods
The bitter orange tree gives three classic materials: cold-pressed peel oil, neroli (steam-distilled blossoms) and orange flower absolute (solvent-extracted blossoms). Smelling them together shows how much the method changes the result.
Materials: Orange oil, neroli, orange flower absolute (or petitgrain if unavailable)
Exercises
- Describe what heat (distillation) removes or adds compared with solvent extraction.
- Research and write two lines on enfleurage, the historic fat-based method, and why it has almost disappeared.
Homework: Start your palette sheet with columns: material, natural or synthetic, family, volatility, strength 1–5, price band, notes on regulation.
Week 2 · Citrus and green molecules
Citrus oils are mostly limonene, which smells surprisingly faint; their character comes from trace molecules such as citral and aldehydes. Green notes add the “snap” of a crushed leaf.
Materials: Limonene, linalool, citral, dihydromyrcenol, cis-3-hexenol, galbanum
Exercises
- Compare lemon oil with limonene alone. Which molecule gives “lemon”?
- Dilute cis-3-hexenol further to 1% and note how a material can change character with dilution.
Homework: Add six entries to your palette sheet and look up each in the Venaro Ingredient library.
Week 3 · Floral molecules
Most floral accords are built from a short list of molecules: phenylethyl alcohol, geraniol and citronellol for rose; benzyl acetate and Hedione for jasmine; hydroxycitronellal for lily of the valley; ionones for violet and iris.
Materials: Phenylethyl alcohol, geraniol, citronellol, benzyl acetate, Hedione, hydroxycitronellal, alpha-isomethyl ionone
Exercises
- Mix PEA, citronellol and geraniol 5:3:2 on a strip and compare it with rose oil.
- Note which of these molecules are EU-labelled allergens.
Homework: Write 150 words on why perfumers rebuilt lily of the valley after Lilial was banned in the EU in 2022.
Week 4 · Woods and ambers
Woody and ambery materials form the skeleton of most modern perfumes. Several are “diffusive” molecules that radiate far beyond their odour strength on the strip.
Materials: Cedarwood, vetiver, patchouli, Iso E Super, Javanol or another sandalwood molecule, Ambroxan, labdanum, benzoin
Exercises
- Spray a 1% solution of Iso E Super in alcohol on fabric and on skin; compare projection after one hour.
- Compare natural sandalwood (if available) with a sandalwood molecule and discuss sustainability.
Homework: Read about ambergris and the creation of Ambrox from sclareol (clary sage).
Week 5 · Musks and animalic notes
Historic animal materials such as deer musk, civet and castoreum are no longer used in fine fragrance. Today musks are made by chemists in three main groups: polycyclic (Galaxolide), macrocyclic (Habanolide, Exaltolide, ethylene brassylate) and alicyclic. Indole and skatole give flowers their animalic depth.
Materials: Galaxolide, Habanolide, ethylene brassylate, Exaltolide, indole (at 1%)
Exercises
- Smell indole at 1% and at 0.01%. Write how concentration changes it from animalic to floral.
- Test yourself for musk anosmia: ask others to smell the same strips.
Homework: Add every musk to your palette sheet with a tenacity score after 48 hours.
Week 6 · Gourmand and fruity molecules
Gourmand perfumery grew from a handful of edible-smelling molecules: vanillin, ethyl vanillin, coumarin, ethyl maltol and lactones. Fruity esters and lactones add juiciness in tiny amounts.
Materials: Vanillin, ethyl vanillin, coumarin, ethyl maltol, gamma-undecalactone, gamma-decalactone
Exercises
- Smell ethyl maltol and try to name the dessert it suggests.
- Compare vanillin and ethyl vanillin at the same dilution: which is stronger and which is more “natural”?
Homework: Complete your 36-material palette sheet.
Final project
Final project: a complete palette sheet of 36 materials, with a one-page reflection on which materials you would choose for a fresh, a floral and an amber perfume, and why.
Safety
Some materials are skin sensitisers or are restricted by IFRA. Always read the supplier’s safety data sheet (SDS), keep everything diluted for smelling, and never apply raw materials to skin.
Further reading
- Günther Ohloff, Wilhelm Pickenhagen and Philip Kraft, Scent and Chemistry: The Molecular World of Odors
- Horst Surburg and Johannes Panten, Common Fragrance and Flavor Materials
- IFRA Standards and the IFRA Transparency List (ifrafragrance.org)
