Sunset Yellow FCF
Title: Sunset Yellow FCF
CAS Registry Number: 2783-94-0
CAS Name: 6-Hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid disodium salt
Additional Names: 1-p-sulfophenylazo-2-naphthol-6-sulfonic acid disodium salt; FD & C Yellow No. 6; C.I. Food Yellow 3; C.I. 15985
Molecular Formula: C16H10N2Na2O7S2
Molecular Weight: 452.37
Percent Composition: C 42.48%, H 2.23%, N 6.19%, Na 10.16%, O 24.76%, S 14.18%
Literature References: Prepn: P. Griess, Ber. 11, 2191 (1878). Metabolism: J. L. Radomski, T. J. Mellinger, J. Pharmacol. Exp. Ther. 136, 259 (1962). Toxicology: I. F. Gaunt et al., Food Cosmet. Toxicol. 5, 747 (1967); 7, 9 (1969); 12, 1 (1974). Review: IARC Monographs 8, 257-266 (1967). See also: Colour Index vol. 4 (3rd ed., 1971) p 4087.
Properties: Orange-red crystals. Absorption max (0.02 N CH3COONH4): 480 nm. Sol in water; slightly sol in ethanol. Reddish-orange soln in conc H2SO4, changing to yellow on dilution. LD50 in rats, mice (g/kg): >10, >6 orally (Gaunt, 1967).
Absorption maximum: Absorption max (0.02 N CH3COONH4): 480 nm
Toxicity data: LD50 in rats, mice (g/kg): >10, >6 orally (Gaunt, 1967)
Use: Provisionally listed for use in food, drugs and cosmetics.

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