Similar names: 1-Naphthalenesulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[4-amino-, disodium salt (9CI); C.I. Direct Red 28, disodium salt (8CI); Atlantic Congo Red; Atul Congo Red; Azocard Red Congo; Benzo Congo Red; Brasilamina Congo 4B; C.I. 22120; C.I. Direct Red 28; Congo Red; Congo red; Congo Red 4B; Congo Red 4BS; Congo Red 4BX; Congo Red CR; Congo red disodium salt; Congo Red H; Congo Red K; Congo Red L; Congo Red M; Congo Red N; Congo Red R; Congo Red RS; Congo Red sodium salt; Congo Red TS; Congo Red W; Congo Red WS; Cotton Red 4BC; Cotton Red 5B; Cotton Red L; Diacotton Congo Red; Direct Congo Red; Direct Red 28; Direct Red C; Direct Red DC-CF; Direct Red K; Direct Red R; Direct Scarlet 4B; Erie Congo 4B; Haemomedical; Haemonorm; Hemorrhagyl; Hispamin Congo 4B; Kayaku Congo Red; MeSH ID: D003224; Mitsui Congo Red; Peeramine Congo Red; Red K (dye); Solucongo; Sugai Congo Red; Tertrodirect Red C; Trisulfon Congo Red; Vondacel Red CL; 1-Naphthalenesulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(2,1-diazenediyl)]bis[4-amino-, sodium salt (1:2) (ACI)