CA Index Name: 1-Naphthalenesulfonic acid, 3-[2-(2,4-dimethyl-5-sulfophenyl)diazenyl]-4-hydroxy-, sodium salt (1:2)
Other Names: 1-Naphthalenesulfonic acid, 3-[(2,4-dimethyl-5-sulfophenyl)azo]-4-hydroxy-, disodium salt; C. I. Food Red 1; C.I. Food Red 1, disodium salt; Ponceau SX; 12101 Red; 1306 Red; C.I. 14700; Certicol Ponceau SXS; D and C Red No. 4; Edicol Supra Ponceau SX; FD and C Red No. 4; FD&C Red No. 4; FDC Red 4; Food Red 1; Food Red 4; Hexacol Ponceau SX; Japan Red 4; Japan Red 504; Japan Red No. 4; Japan Red No. 504; Red 4; Red No. 1; Red No. 504; Usacert Red No. 4
Merck Index Number: 7591
Chemical / Dye Class: Azo
Molecular Formula: C18H14N2Na2O7S2
Molecular Weight: 480.42
Physical Form: Red crystals
Solubility: Soluble in water, ethanol
Melting Point: > 300 °C
Absorption (λmax): 500 nm
Synthesis: Synthetic methods
Staining Applications: Animal feed; drinks; candies; frozen food; meat; microorganisms; sausage casings; lotion; eye shadows; lips; skin; hairs; keratin fibers
Biological Applications: Detecting proteins; treating acquired resistance to GABAergic (ARG) agents; Shampoos; soaps
Industrial Applications: Inks; cleansing products; fabric softener; herbicides; perfumes
Safety / Toxicity: Acute toxicity; carcinogenicity; chronic toxicity; Genotoxicity; mutagenicity