| SYNONYMS | CARMOISINE * C. I. FOOD RED 3 * AZORUBINE AS * ACID RED 14 |
| DEFINITION | Carmoisine consists essentially of disodium 4-hydroxy-3-(4-sulfonato-1-naphthylazo) naphthalene-1-sulfonate and subsidary colouring matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components. |
| CLASS | Monoazo |
| COLOUR INDEX NO. | 14720 |
| EEC NUMBER | E-122 |
| EINECS | 222-657-4 |
| CHEMICAL NAMES | Disodium 4-hydroxy-3-(4-sulfonato-1-nephthylazo) naphthalene-1-sulfonate |
| CHEMICAL FORMULA | C10H12N2Na2O7S2 |
| MOLECULAR WEIGHT | 502.44 |
| ASSAY | Content not less than 85% total colouring matters, calculated as the sodium salt. |
| E 1% 1cm 510 at ca 516 nm in aqueous solution. | |
| DESCRIPTION | Red to maroon powder |
| IDENTIFICATION | |
| a. Spectrometry | Maximum in water at ca 516 nm . |
| b. Red solution in water | |
| PURITY | Not more than 0.2% |
| Water Insoluble matter | |
| Subsidiary colouring matters | Not more than 2.0% |
| Organic compounds other than colouring matters | [4-Aminonaphthalene-1-sulfonic acid / 4-hydroxynaphthalene-1-sulfonic acid] - Total not more than 0.5% |
| Unsulfonated primary aromatic amines | Not more than 0.01% (Calculated as aniline) |
| Ether extractable matter | Not more than 0.2% under neutral conditions |
| Arsenic | Not more than 3 mg/kg. |
| Lead | Not more than 10 mg/kg. |
| Mercury | Not more than 1 mg/kg. |
| Cadmium | Not more than 1 mg/kg. |
| Heavy metals (as Pb) | Not more than 40 mg/kg. |
