SYNONYMS	PATENT BLUE V * C. I. FOOD BLUE 5
DEFINITION	Patent Blue V consists essentially of the calcium or sodium compound of [4-(alpha-(4-diethylaminophenyl)-5-hydroxy-2,4-disulfophenyl-methylidene)
	2,5-cyclohexadien-1-ylidene] diethylammonium hydroxide inner salt and subsidary colouring metters together with sodium chloride and/or calcium sulfate as the principal uncoloured components.
	The potassium salt is also permitted.
CLASS	Triarylmethane
COLOUR INDEX NO.	42051
EEC NUMBER	E-131
EINECS	222-573-8
CHEMICAL NAMES	The calcium or sodium compound of [4-(alpha-(4-diethylaminophenyl)-5-hydroxy-2,4-disulfophenyl-methylidene)
	2,5-cyclohexadien-1-ylidene] diethylammonium hydroxide inner salt
CHEMICAL FORMULA	Calcium compound : C27H31N2O7S2Ca1/2
	Sodium compound : C27H31N2O7S2Na
MOLECULAR WEIGHT	Calcium compound : 579.72
	Sodium compound : 582.67
ASSAY	Content not less than 85% total colouring matters, calculated as the sodium salt
	E 1% 1cm 2 000 at ca 638 nm in aqueous solution at pH 5
DESCRIPTION	Dark-blue powder
IDENTIFICATION
a. Spectrometry	Maximum in water at ca 638 nm at pH 5
b. Blue 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	[3-hydroxy benzaldehyde / 3-hydroxy benzoic acid / 3hydroxy-4- sulfobenzoic acid / N,N-diethylamino benzene sulfonic acid] - Total not more than 0.5%
Leuco base	Not more than 4.0%
Unsulfonated primary aromatic amines	Not more than 0.01% (Calculated as aniline)
Ether extractable matter	From a solution of  pH 5, not more than 0.2%
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)