ABSTRACT
Yellow crystals; leaflets from ethanol; mp, 114-117°C.1 Decomposes on exposure to heat or light.2
Chemical Properties
Insoluble in water; soluble in alcohol, benzene chloroform, ether, petroleum ether, mineral acids, and oils. Red at pH 2.9, yellow at pH 4.02.1
Structure
Physiological Properties and Health Hazards
Animal carcinogen.2-5 Factory workers may develop contact dermatitis.4 The characteristic acute toxic effect is methemyglobinemia. LD50 (oral, rat) 200 mg/kg4; LD50 (i.p., mouse) 500 mg/kg; LD50 (oral, mouse) 300 mg/kg.5 Reasonably anticipated to be a human carcinogen.2
