C.I. Direct Black 4

Synonyms

2,7-Naphthalenedisulfonic acid, 4-amino-3-((4'-((2,4-diamino-5-methylphenyl)azo)(1,1'-biphenyl)-4-yl)azo)-5-hydroxy-6-(pheylazo)-, disodium salt; Ahco Direct Black RW; Airedale Black RWD; Atlantic Black RW; Azine Deep Black 3RL; Azocard Black RW; Bencidal Black RW; Benzanil Black RW; Benzo Deep Black RW; Benzo Leather Black RW; Black 3EMBL; C.I. 30245; C.I. Direct Black 4 (VAN); CI 30245; CI Direct Black 4, disodium salt; Carbide Black ER; Carbide Black FC; Chloramine Black E2B; Chloramine Black W; Chlorazol Black LF; Chlorazol Black LFA; Chrome Leather Black ER; Chrome Leather Black FC; Coir Deep Black R; Cotton Black MT; Diamine Deep Black RW; Diamine Direct Black RW; Diaphtamine Black MT; Diazine Direct Black BR; Diazine Direct Black R; Diazo Black RW; Diazol Black ER; Diazol Black ERN; Diphenyl Deep Black VN; Direct Black 3RX; Direct Black 4RX; Direct Black K; Direct Black MR; Direct Black R; Direct Black RW; Direct Black RWN; Direct Deep Black RW; Direct Deep Black RWA-CF; Direct Diazo Black RW; Enianil Black RCN; Erie Black RB; Erie Black RF; Erie Black RRAC; Erie Black RW; Erie Black RX; Fenamin Black RW; Formic Black MTR; Hispamin Black 3RX; Nippon Deep Black 3RL; Nippon Deep Black RL; Nippon Deep Black RL Extra; Paper Black RW; Paper Deep Black R; Paraldehyde Black RW; Phenamine Black RW; Pontamine Black RR; Pontamine Black RRX; Tertrodirect Black RW; Tetrazo Deep Black R; Vondacel Black RW; [ChemIDplus]

Category

Benzidine Dyes

Sources/Uses

Used as a dye for cellulose, wool, silk, leather, paper, and nylon; [HSDB]

Comments

One of the azo dyes metabolized to benzidine--known to be a human carcinogen; [NTP]

Biomedical References

Human carcinogen

Processes

Industrial Processes with risk of exposure:

• Leather Tanning and Processing
• Pulp and Paper Processing
• Textiles (Printing, Dyeing, or Finishing)