In short
A citrus composition is built almost entirely on the materials that leave first, so you design it around that fact. You can write a classic cologne, whose brief accepts that it will be light and short-lived, or a modern citrus whose fresh idea is continued by quieter materials. Use the composition method from Compose a Floral Perfume.
What you will learn
- Compose around volatile top materials
- Design a handover that continues a fresh impression
- Choose strength and expectations to fit the style
Before this lesson: Compose an Amber Perfume
Two briefs, two structures
| Part | Classic cologne | Modern citrus |
|---|---|---|
| Citrus | 40 to 60% | 20 to 35% |
| Aromatic and petitgrain | 15 to 30% | 5 to 15% |
| Neroli or light floral | 5 to 15% | 10 to 25% |
| Clean support | Small | 15 to 30%: Hedione, light woods |
| Musk or base | Very small | 10 to 20% |
| Usually worn at | Low strength, often | Medium strength |
Read our guide to the eau de cologne formula, and Mandarin Tiles in the library for a citrus-over-neroli structure. The Journal's history of eau de cologne explains where it came from.
Fresh after the citrus has gone
Your citrus workshop showed that citrus leaves quickly whatever you do. So plan each stage:
- First half hour: real citrus, with the oil chosen for character.
- First two hours: neroli, petitgrain, linalyl acetate, with bitterness and floral freshness.
- After that: an airy floral and clean musk, which read as freshness even though no citrus remains.
Be honest in your notes about which of these you actually smell. It is easy to imagine that citrus is still there.
Practical points
- Fresh stock only. Citrus oils oxidize readily, which spoils them and has safety implications. Date your bottles. Smell before each use.
- Phototoxicity. Bergamot and other expressed citrus oils can be phototoxic, and IFRA's rules for this cover combinations of them. Use FCF grades where you can. Read the phototoxicity guide, and take a note of what you used. This project stays on strips regardless.
- Allergens. Limonene, linalool, citral and others have labeling implications that are large in citrus compositions. You will calculate them in Level 10.
- Waxes. Cold-pressed oils contain non-volatile material, which may cloud a dilution. Note it, and do not assume a fault.
Test it against a reference
A commercial cologne you own is a useful control, if you recognize that its strength and formula are unknown. Prepare strips together and rate them over time. It will tell you whether your fading is unusually quick. It will not tell you how to match it, and that is not your aim.
Practical exercise: Composition 4: a complete citrus
- Choose classic or modern, and write the brief with an honest statement of how long it should last.
- Compare three citrus oils, and pick a lead character.
- Build the citrus, the middle and the base in that order, across separate rounds. Use only fresh citrus.
- Run a timed comparison against a reference: 5, 15 and 30 minutes, then 1, 2 and 4 hours.
- Note where you thought you smelled citrus. Repeat blind if possible.
- Score it against the assessment criteria.
You have done this well if your stated longevity matches what you observed, and the composition feels fresh without leaning on any invisible citrus.
Common mistakes
- Promising it will last all day. A cologne is not designed to.
- Using oxidized oil. Check date and smell, and replace if in doubt.
- Stopping at the citrus. Without a designed middle, the fragrance simply ends.
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.