| PATENT BLUE V |
| |
|
| 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
b. Blue solution in water |
Maximum in water at ca 638 nm at pH 5 |
PURITY
Water Insoluble matter |
Not more than 0.2% |
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 (as Pb) |
Not more than 40 mg/kg. |
| |
