In short
A training library is a small set of materials, about a dozen to begin with, chosen to cover different families and to teach clear ideas, then kept at 10% with full documentation. Learning twelve materials thoroughly will prepare you for accord work far better than owning a hundred you can barely tell apart.
What you will learn
- Choose a small set of materials that covers a range of families and teaches clear ideas
- Prepare and document each one to a consistent standard
- Assess your readiness for accord work
Before this lesson: How to Store Perfume Materials, A Daily Olfactory Training Routine
What to look for in a choice
- Range. Cover citrus, herbal, floral, woody, sweet and musky characters.
- Clarity. Prefer materials that have one idea you can learn, particularly at first.
- Usefulness. Choose materials that you will really use when you start building accords.
- Manageability. Avoid the costly, the very powerful and the heavily restricted for now.
A suggested set
The following set is a teaching suggestion, not a standard, and you can substitute for cost or availability. The reference beginner materials list gives more options and explains its choices. Check current availability and restrictions in your region when you buy.
| Character | Material | Why it is here |
|---|---|---|
| Citrus | Bergamot oil | Complex, with a floral edge. Teaches natural complexity, and is phototoxic unless FCF, so it teaches caution as well. |
| Citrus | Lemon oil | Comparison with bergamot, and quick to fade |
| Herbal | Lavender oil | Everyday reference, and it shows linalool in context |
| Floral, light | Linalool | One molecule from many natural oils |
| Floral, rose | Phenylethyl alcohol | A soft rose base for later accords |
| Floral, jasmine | Benzyl acetate | A fruity floral building block |
| Airy floral | Hedione | Shows how a quiet material changes others |
| Woody | A cedarwood oil | Clear, affordable wood reference |
| Woody-amber | Iso E Super | Tests your own sensitivity, and blends widely |
| Sweet | Vanillin | A clear base note, and your practice in dissolving a solid |
| Hay, sweet | Coumarin | Historic and useful. Later needed for fougères. Check its restrictions. |
| Musk | Ethylene brassylate | Clean base, and it shows long-lasting behavior on a strip |
You also need a solvent, usually perfumer's alcohol, and your equipment from the earlier lessons.
Buying
- Buy small. For study, 5 to 30 g is plenty of most materials, particularly since 1 g of neat material makes 10 g at 10%.
- Buy documented. Choose a supplier who gives you the SDS and identifies each material clearly. The guide to sourcing raw materials covers what to ask and what shipping rules may apply.
- Avoid unnamed blends. A product named only "Rose Fragrance Oil" cannot teach you a material.
- Check rules where you live. Shipping, alcohol and some materials are subject to local restrictions.
Arranging it
Group your vials by family, in a fixed order, and keep them that way. Position helps your memory, and it saves you time. That is the small-scale idea behind a full perfume organ. Keep your neat stock stored separately in cool, dark conditions, as described in the storage lesson. Keep dilutions in small vials with caps that seal.
Documenting it
Every material gets one record:
| Field | Example |
|---|---|
| Name on the label | Bergamot oil |
| Identity | CAS number, botanical name if natural |
| Supplier and lot | Supplier name, lot number |
| Dates | Received, opened |
| Dilution | 10% in ethanol, made Oct 31, 2026 |
| Safety notes | From the SDS, such as phototoxicity and skin sensitization |
| Your evaluation | Words at 1 minute, 1 hour, 4 hours and 24 hours |
A paper log or a spreadsheet is fine. In the RUŌOD Lab app you can keep these as material records with your own fields, and those same records then feed its formula calculations when you get to Level 5. The Free plan has a limit on the number of records, which a library this size fits within, and the pricing section explains the plans. The material encyclopedia is a useful reference to compare your notes against.
Are you ready for Stage B?
Level 4 begins building accords. Check yourself before you start:
- Can you recognize most of your library blind, with a score above chance?
- Can you calculate and make any dilution without looking up the method?
- Is everything you own labeled, logged and safely stored?
- Do you have a written evaluation of each material over time?
If so, you have done what Stage A set out to do. Accord construction is planned, and the full syllabus shows what is ready and which guides you can read in the meantime, such as fragrance accords explained. Reread the brief you wrote in the lesson on how perfumers work and see how differently it reads now.
Practical exercise: The Stage A project: your documented library
This is the Stage A project. Expect to spread it over several sessions.
- Decide your list of about twelve materials. Write down why each is included, and what you substituted and why.
- Buy small quantities. Download every SDS, and read the key sections before opening each bottle.
- Make a 10% dilution of each. Solids and very strong materials may need different handling, or a lower strength.
- Label everything, and enter each one into your log using the fields above.
- Evaluate each material on a strip over 24 hours. Do three or four in a session, not all twelve.
- Run a blind check across the set, and record your score.
- Write a final page on your strongest and weakest materials, and which ones you most want to use in an accord.
You have done this well if every material has a dated card with a dilution and a source, your recognition score is written down, and your final page names specific materials rather than general impressions.
Common mistakes
- Buying a huge kit. Materials age, and you cannot study a hundred at once.
- Skipping the records because you plan to do them later. You will not remember the lot number or date.
- Evaluating everything in one sitting. Fatigue will make the later ones meaningless.
- Treating a suggested list as the only one. Choose what you can get, afford and enjoy learning from.
Safety
Some of these materials carry specific hazards or restrictions: bergamot oil that is not FCF can be phototoxic, and several others are sensitizers or subject to IFRA Standards. Read each SDS. The exercise dilutions are for smelling on paper, and are not for wearing.
Key terms
- Training library
- A small, deliberately chosen set of materials, kept mainly at 10%, used for learning rather than production.
- Perfume organ
- A perfumer's organized arrangement of materials at the workbench, often tiered, named after the musical instrument.
Knowledge check
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.