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Fragrance allergens › Alpha-Isomethyl Ionone
Alpha-Isomethyl Ionone (CAS 127-51-5) is one of the fragrance allergens the European Union requires to be named on a label once it passes a threshold. It is rarely something you added on purpose: 21 materials in this catalog carry it as a constituent, which is how a formula ends up over the line without a single line item admitting to it.
How much Alpha-Isomethyl Ionone can go in a perfume (IFRA limit)
How to label a perfume for sale
Check a formula against the IFRA limits in the free calculator
Elegant orris-violet with a powdery, slightly woody and waxy character, cleaner and finer than the straight ionones. Workhorse of iris and violet bases and a diffusive floralizer used generously in fine fragrance and soap.
It is a material in its own right, not only a line on a label: its catalog page carries the full profile.
The 30% ceiling covers the methyl ionone isomers together, not each isomer on its own.
0 of the 22 carriers in this catalog are naturals and 22 are synthetic. The heaviest carrier that is not the molecule itself is Ultralia, at about 75%.
| Material | Estimated content |
|---|---|
| Alpha-Isomethyl Ionone the material itself | 100% |
| Ultralia | 75% |
| Iris (F-TEC) | 30% |
| Violet (F-TEC) | 30% |
| Fruity Ionone (F-TEC) | 25% |
| Orris (F-TEC) | 25% |
| Ionone Fruity (F-TEC) | 20% |
| Orris Liquid | 20% |
| Fixomusk 997971D | 12% |
| Cassie (F-TEC) | 10% |
| Olibanum CNC | 10% |
| Flower Bouquet (F-TEC) | 6.0% |
| Rose Aldehyde (F-TEC) | 6.0% |
| O-Orchid (F-TEC) | 5.0% |
| Powdery (F-TEC) | 5.0% |
| R-Rose (F-TEC) | 4.0% |
| Broom (F-TEC) | 4.0% |
| Honey Oliffac DEPR 0512 | 3.0% |
| Arabian Oud (F-TEC) | 0.20% |
| Black Tea Base | 0.03% |
| Honey Supreme | 0.00% |
| Blackcurrant (F-TEC) | 0.00% |
Estimates from typical published compositions, not a certificate of analysis for your bottle. A supplier's own figures always win.
PerfuMate totals these across a whole formula while you compose, counting the same molecule arriving from several materials at once, and writes the declaration for the back of the bottle. Start a formula, free. No account needed.
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