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Chemical Name: Pigment Yellow 100 Synonyms: Food Yellow 4:1; Food Yellow 4 Aluminum Lake; Titanium Aluminium Lake; Certolake Tartrazine; 4,5-Dihydro-5-oxo-1-(4-sulfophenyl)-4-[(4-sulfophenyl)azo]-1H-pyrazole-3-carboxylic acid aluminum complex CAS No.:?61116-28-7 Molecular Formula: C16H9N4O9S2.3Na Molecular Weight: 534.368 Appearance: Yellow powder