| CARMOISINE |
| |
|
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
b. Red solution in water |
Maximum in water at ca 516 nm . |
PURITY
Water Insoluble matter |
Not more than 0.2% |
| 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. |
