Sunset yellow is a di sodium salt of 1-(4-sulphophenylazo)-2-napthol-6-sulphonic acid. It is either available in solid or granular form. It particularly reflects orange red color.
| Molecular Description | Composition | |
| 1. | Total colour/Assay, percent by Mass, Min | 85 |
| 2. | Water-insoluble matter, percent by mass, Max. | 0.2 |
| 4. | Combined ether extracts, percent by mass, Max. | 0.2 |
| 5. | Subsidiary dyes, percent by mass, Max. Lower sulfonated. Higher sulfonated. |
05.00 |
| 8. | Dye intermediates, percent by mass, Max. 2-Napthol-6-sulfonic acid aniline-4-sulphonic acid |
00.50 |
| 9. | Unsulfonated primary aromatic amine (calculated as aniline) percent by mass, Max. |
0.01 |
| 10. | Lead, mg/kg, Max. 10.00 8) Arsenic, mg/kg, Max. | 3 |
| 11. | Heavy metals, (as pb) mg/kg, Max. | 40 |
| 12. | Mercury, mg/kg, Max. | 1 |
| 13. | Cadmium, mg/kg, Max. | 1 |
| 14 | Calcium Stability | Passes The Test |