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| PONCEAU 4R |
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| SYNONYMS |
PONCEAU 4R*C.I.FOOD RED7 * NEW COCCINE * ACID RED 18 |
| DEFINITION |
Ponceau 4R consists essentially of trisodium 2-hydroxy-1(4-sulfonato-1-naphthylazo) naphthalene-6,8-disulfonate and subsidary colouring matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components.
Ponceau 4R is described as the sodium salt. The calcium and the potassium salt are also permitted. |
| CLASS |
Monoazo |
| COLOUR INDEX NO. |
16255 |
| EEC NUMBER |
E-124 |
| EINECS |
220-036-2 |
| CHEMICAL NAMES |
Trisodium 2-hydroxy-1-(4-sulfonato-1-nephthylazo) naphthalene-6,8-disulfonate |
| CHEMICAL FORMULA |
C20H11N2Na3O10S3 |
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| MOLECULAR WEIGHT |
604.48 |
| ASSAY |
Content not less than 80% total colouring matters, calculated as the sodium salt; E 1% 1cm 430 at ca 505 nm in aqueous solution. |
| DESCRIPTION |
Reddish powder |
IDENTIFICATION
a. Spectrometry
b. Red solution in water |
Maximum in water at ca 505 nm . |
PURITY
Water Insoluble matter |
Not more than 0.2% |
| Subsidiary colouring matters |
Not more than 1.0% |
| Organic compounds other than colouring matters |
[4-Aminonaphthalene-1-sulfonic acid / 7-hydroxynaphthalene-1,3-disulfonic acid / 3-hydroxynaphthalene-2,7-disulfonic acid / 6-hydroxynaphthalene-2-sulfonic acid / 7-hydroxynaphthalene-1,3-6-trisulfonic 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. |
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