Is Acid Yellow 9 vegetarian?
Acid Yellow 9
Fast Yellow AB is a synthetic azo dye formerly used as a food colourant (E105) in Europe, now delisted and prohibited in both Europe and the USA due to toxicological concerns including links to non-atopic asthma. It may still be used in non-food applications.
| Also known as | Acetyl Yellow, Acid Yellow 9, Disodium 2-amino-5-[(4-sulphonatophenyl)azo]benzenesulphonate, Fast Yellow, Food Yellow 2, Metanilgelb |
|---|---|
| INCI name | Acid Yellow 9 |
| E number | E105 |
| INS number | 105 |
| CAS number | 2706-28-7 |
| EC number | 220-293-0 |
| CI number | CI 13015 |
| CosIng ID | 32709 |
| Last reviewed | 3 June 2026 |
An ingredient is considered vegetarian if it avoids components derived from killing an animal.
Classifications are made to the best of our knowledge based on available scientific and regulatory sources. We cannot guarantee the accuracy of every entry, errors in the sources we draw from can always occur. This tool also cannot account for cross-contamination, which depends entirely on individual suppliers and producers. If you believe a classification is incorrect, you can report an issue.
