| SYNONYMS |
BLACK PN * C. I. FOOD BLACK 1 * BRILLIANT BLACK BN |
| DEFINITION |
Black PN consists essentially of tetrasodium-4-acetamido-5-hydroxy-6-[7-sulfonato-4'-
(4-sulfonatophenylazo)-1-naphthylazo] naphthalene 1,7-disulfonate and subsidary colouring matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components.
Black PN is described as the sodium salt. The calcium and the
potassium salt are also permitted. |
| CLASS |
Bisazo |
| COLOUR INDEX NO. |
28440 |
| EEC NUMBER |
E-151 |
| EINECS |
219-746-5 |
| CHEMICAL NAMES |
Tetrasodium 4-acetamido-5-hydroxy-6-[7-sulfonato-4-(4-sulfonatophenylazo)-1-
naphthylazo] naphthalene 1,7-disulfonate |
| CHEMICAL FORMULA |
C28H17N5Na4O14S4 |
| MOLECULAR WEIGHT |
867.69 |
| ASSAY |
Content not less than 80% total colouring matters, calculated as the sodium salt
E 1% 1cm 530 at ca 570 nm in solution |
| DESCRIPTION |
Black powder
|
| IDENTIFICATION |
|
a. Spectrometry
b. Black - Bluish solution in water |
Maximum in water at ca 570 nm |
PURITY
Water Insoluble matter |
Not more than 0.2% |
| Subsidiary colouring matters |
Not more than 10% (expressed on the dye-content) |
| Organic compounds other than colouring matters |
[4-acetamido-5-hydroxynaphthalene-1,7-disulfonic acid / 4-amino-5-hydroxynaphthalene-1,7-disulfonic acid / 8-aminonaphthalene-2-sulfonic acid / 4,4'-diazoaminodi-(benzenesulfonic acid)] - Total not more than 0.8%
|
| Unsulfonated primary aromatic amines |
Not more than 0.01% (Calculated as aniline) |
| Ether extractable matter |
Not more than 0.2% under nautral 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. |
