Is Disodium 3-hydroxy-4-[(4-methyl-2-sulphonatophenyl)azo]-2-naphthoate vegan?

Pigment Red 57 is also known as Disodium 3-hydroxy-4-[(4-methyl-2-sulphonatophenyl)azo]-2-naphthoate.

Lithol Rubine BK is a synthetic azo dye used exclusively for colouring the surface of hard cheeses in food applications. It is not permitted as a general food or cosmetic colorant.

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