Is Pyridinium, 1- methyl-4-[( methylphenylhydrazono)methyl]-, methyl sulfate ( CI Basic Yellow 87 ) vegan?

Basic Yellow 87 is also known as Pyridinium, 1- methyl-4-[( methylphenylhydrazono)methyl]-, methyl sulfate ( CI Basic Yellow 87 ).

Basic Yellow 87 is a synthetic cationic dye used in hair colouring cosmetic products, chemically a pyridinium hydrazone methyl sulfate salt.

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