has part has part has_part Congo Red CHEBI:34653 chebi_ontology An indicator dye that is blue-violet at pH 3.0 and red at pH 5.0. Kongorot Direct red 28 disodium 3,3'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(4-aminonaphthalene-1-sulphonate) Congo red Sodium diphenyldiazo-bis-alpha-naphthylaminesulfonate 3,3'-(biphenyl-4,4'-diyldidiazene-2,1-diyl)bis(4-aminonaphthalene-1-sulfonate) 3,3'-(biphenyl-4,4'-diyldidiazene-2,1-diyl)bis(4-aminonaphthalene-1-sulfonic acid) bis(azo) compound