In short
Reviewing another perfumer's formula means first making it faithfully and working out what it's trying to do, then proposing the smallest change that addresses a real problem. Reformulation at work, collaboration, mentoring and teaching all need this. It also changes the way you see your own formulas, since you start to read them from the outside.
What you will learn
- Read a formula for intent before changing it
- Propose and test minimal changes
- Handle credit, confidentiality and permission
Before this lesson: A Framework for Structured Critique
The sequence
- Get permission and scope. Whose is it? What do they want? Are you allowed to change or keep it?
- Read the record. Check it totals 100%, and check any dilutions. See reading a formula.
- Query what's ambiguous. Units, grades, dilution, suppliers. Don't guess.
- Make it faithfully. Note any substitution, since it may change your conclusions.
- Critique before changing. Use the framework, and state the author's intent.
- Understand each section. Group the lines, and work out what each group does.
- Propose changes. Limit yourself to a few, with hypotheses.
- Test blind against the original. Your version has to beat it, for that purpose.
- Report. Show changes, evidence and what you chose to leave alone.
Reading for intent
Some things that look like errors are choices. A line at 0.01% might be a mistake, or the trace that gives the entire formula its character. A large share of something simple might be an overdose on purpose. Before you call anything wrong, remove it in a test. A useful rule is to assume competence until the tests show otherwise.
Keep your own taste out of it
It's easy to turn someone's fragrance into your own. Ask for each change: does it solve a problem they care about, or do I just prefer it? Compare it with your signature audit. If your usual musk has appeared in the revision, ask why.
Sample change proposal, invented
| Problem observed | Evidence | Proposed change | Test | Result to report |
|---|---|---|---|---|
| Hole at about 30 minutes | Two assessors, on strips | Raise a low-volatility citrus by 1 part, reduce solvent | Blind against original at 15, 30 and 60 minutes | Your finding |
| Over budget by 15% | Costing | Reduce the rose absolute by a quarter; add a small rose alcohol blend | Blind at 2 hours; cost check | Your finding |
Permission, credit and confidentiality
- Ownership. Who owns the revision? Agree before you start. See the ownership guide.
- Credit. Say what you did, and don't take credit for the author's idea.
- Confidentiality. Keep the formula safe, and don't show it to others without permission. Don't reuse a private accord elsewhere.
- Published formulas. Using a library formula for study is different from selling a version of it. Read its terms, and remember that a formula's publication doesn't mean that anyone has confirmed its safety for your use.
- Mentoring. Teach them to find it themselves, where possible.
What the library is for
The formula library gives you real structures to study, with every ingredient linked. Use them as teaching material. They range from community to house formulas, and each one's page describes its status. Nothing here means that an edited version is validated, so your own changes need all the usual checks.
Practical exercise: Revise a library formula
- Choose a formula from the library, or from a willing peer with their written agreement.
- Check the record, and make it faithfully on a small scale. Note any substitutions.
- Write a critique, and group its lines by job.
- Propose at most three changes, with hypotheses, and test each blind against your faithful version.
- Write a one-page note to the author: what you found, what you changed, what you'd leave alone, and why.
You have done this well if you made the original first, your changes are few and evidence-based, and you could send your note without embarrassment.
Common mistakes
- Rewriting instead of revising. That's another project.
- Fixing what isn't broken. Test removals first.
- Testing against memory. Keep the faithful version on hand.
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.