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	Maximum in water at ca 570 nm
b. Black - Bluish solution in water
PURITY	Not more than 0.2%
Water Insoluble matter
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	Not more than 40 mg/kg.
(as Pb)