SANCO/11368/2011-EN Rev. 3 - Izba Mleka

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Definition Patent Blue V consists essentially of the calcium or
sodium compound of [4-(α-(4-diethylaminophenyl)-5hydroxy-2,4-disulfophenyl-methylidene)2,5cyclohexadien-1-ylidene]
diethylammonium hydroxide
inner salt and subsidiary colouring matters together with
sodium chloride and/or sodium sulphate and/or calcium
sulphate as the principal uncoloured components.
Colour Index No 42051
EINECS 222-573-8
The potassium salt is also permitted.
Chemical name The calcium or sodium compound of [4-(α-(4diethylaminophenyl)-5-hydroxy-2,4-disulfophenylmethylidene)
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
E1 cm 1 % 2 000 at ca 638 nm in aqueous solution at pH 5
Description Dark-blue powder or granules
Identification
Purity
Appearance of the aqueous
solution
Blue
Spectrometry Maximum in water at 638 nm at pH 5
Water insoluble matter Not more than 0,2 %
Subsidiary colouring
matters
Organic compounds other
than colouring matters:
3-hydroxy
benzaldehyde
Not more than 2,0 %
Total not more than 0,5 %
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