Is 2-[[(4-methoxyphenyl)methylhydrazono]methyl]-1,3,3-trimethyl-3H-indolium methyl sulfate (CI 48054) vegan?

Basic Yellow 28 is also known as 2-[[(4-methoxyphenyl)methylhydrazono]methyl]-1,3,3-trimethyl-3H-indolium methyl sulfate (CI 48054).

Basic Yellow 28 is a synthetic methine/hemicyanine cationic dye used as a colorant in hair dye formulations.

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