Fast Green FCF
Title: Fast Green FCF
CAS Registry Number: 2353-45-9
CAS Name: N-Ethyl-N-[4-[[4-[ethyl[(3-sulfophenyl)methyl]amino]phenyl](4-hydroxy-2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfobenzenemethanaminium inner salt disodium salt
Additional Names: FD & C Green No. 3; C.I. Food Green 3; C.I. 42053
Molecular Formula: C37H34N2Na2O10S3
Molecular Weight: 808.85
Percent Composition: C 54.94%, H 4.24%, N 3.46%, Na 5.68%, O 19.78%, S 11.89%
Literature References: Prepn: H. Johnson, P. Staub, Ind. Eng. Chem. 19, 497 (1927). Toxicity studies: F. C. Lu, A. Lavalle, Can. Pharm. J. 97, 30 (1964); W. H. Hansen et al., Food Cosmet. Toxicol. 4, 389 (1966). Review of carcinogenicity studies: IARC Monographs 16, 187-197 (1978). See also: Colour Index vol. 4 (3rd ed., 1971) p 4383.
Properties: Dark green powder or granules with a metallic lustre. Absorption max: 628 nm. Very sol in water; sol in ethanol. Dull orange soln in conc H2SO4, changing to dull green on dilution. Orange soln in conc HCl or conc HNO3. Bright blue soln in 10% aq NaOH. LD50 orally in rats: >2 g/kg (Lu, Lavalle).
Absorption maximum: Absorption max: 628 nm
Toxicity data: LD50 orally in rats: >2 g/kg (Lu, Lavalle)
Use: Biological stain. Color additive in food, drugs and cosmetics.

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