2,7-Naphthalenedisulfonic acid, 4-amino-3-[[4'-[(1-amino-5-sulfo-2-naphthalenyl)azo][1,1'-biphenyl]-4-yl]azo]-5-hydroxy-6-(phenylazo)-, trisodium salt 6486-54-0 C.I. 30270 C.I. Direct Black 131 C.I. Direct Black 131, trisodium salt CI 30270 Cotton Black 3G Direct Black 131 Direct Black 3G Erie Black CW NSC79745 Paradiamine Blue Black 3B Paradiamine Blue Black 3B Extra Conc Pontamine Black AWG Special Black 3G Special Black 3GR