1-Naphthalenesulfonic acid, 3,3'-[4,4'-biphenylenebis(azo)]bis[4-amino-, disodium salt 1-Naphthalenesulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[4-amino-, disodium salt 573-58-0 Atlantic Congo Red Atul Congo Red Azocard Red Congo Benzo Congo Red Brasilamina Congo 4B C.I. 22120 C.I. Direct Red 28 C.I. Direct Red 28, Disodium Salt Congazone sodium Congo Red Congo Red 4B Congo Red 4BX Congo Red CR Congo Red H Congo Red ICI Congo Red L Congo Red M Congo Red N Congo Red R Congo Red RS Congo Red W Congo Red WS Cotton Red 4BC Cotton Red 5B Cotton Red L Diacotton Congo Red Direct Red 28 Direct Red C Direct Red DC-CF