Carmoisine lake pigment is an aluminum salt of the azo dye Carmoisine, primarily used as a red coloring agent in food and cosmetics. Its structure consists of sulfonated naphthalene rings coordinated with aluminum ions, contributing to its water-insoluble pigment form.
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CAS 84041-67-8
Carmoisine
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dialuminum;tris(4-hydroxy-3-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate)
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C1=CC=C2C(=C1)C(=CC=C2S(=O)(=O)[O-])N=NC3=C(C4=CC=CC=C4C(=C3)S(=O)(=O)[O-])O.C1=CC=C2C(=C1)C(=CC=C2S(=O)(=O)[O-])N=NC3=C(C4=CC=CC=C4C(=C3)S(=O)(=O)[O-])O.C1=CC=C2C(=C1)C(=CC=C2S(=O)(=O)[O-])N=NC3=C(C4=CC=CC=C4C(=C3)S(=O)(=O)[O-])O.[Al+3].[Al+3]
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