Direct Blue 6

**Semantic type:** Hazardous or Poisonous Substance

**Definition:** A Benzidine-based azo dye that is metabolized to free Benzidine in vivo. Direct blue 6 is primarily used for the dyeing of textiles, leather and paper. Benzidine and its metabolic derivatives have been detected in the urine of workers exposed to Benzidine-based dyes. Exposure to this dye is strongly associated with the occurrence of bladder cancer. (NCI05)

**Synonyms:** - 3,3'-[(1,1'-Biphenyl)-4,4'-Diylbis(Azo)]Bis(5-Amino-4-Hydroxy)- 2,7-Naphthalenedisulfonic Acid, Tetrasodium Salt - CI 22610 - CI Direct Blue 6 - DIRECT BLUE 6 - Diphenyl-4,4'-Bis-Azo-2"-8"-Amino-1"-Naphthol-3",6"-Disulphonatesodium