Title: Scarlet Red
CAS Registry Number: 85-83-6
CAS Name: 1-[[2-Methyl-4-[(2-methylphenyl)azo]phenyl]azo]-2-naphthalenol
Synonyms: C.I. Solvent Red 24;
o-tolylazo-
o-tolylazo-b-naphthol; 1-(4-
o-tolylazo-
o-tolylazo)-2-naphthol; C.I. 26105
Trademarks: Biebrich Scarlet Red; Sudan IV; Fat Ponceau R
Molecular Formula: C24H20N4O
Molecular Weight: 380.44
Percent Composition: C 75.77%, H 5.30%, N 14.73%, O 4.21%
Literature References: Prepd by diazotizing
o-aminoazotoluene and coupling with b-naphthol:
Colour Index vol. 4 (3rd ed., 1971) p 4227. Review of carcinogenicity studies:
IARC Monographs 8, 217 (1975).
Properties: Dark brown powder. Softens at 175°; mp 181-188°; dec completely at 260°. Practically insol in water. One gram dissolves in 15 ml chloroform. Sol in oils, fats, warm petrolatum, paraffin, phenol. Slightly sol in acetone, alcohol, benzene.
Melting point: mp 181-188°
Use: Fat stain.
Therap-Cat: Has been used to promote wound healing.
Therap-Cat-Vet: Has been used to stimulate healing of wounds.
