Synonyms: Diphenyl Black FF;(3Z)-3-[[4-[(4-amino-6-sulfonatonaphthalen-1-yl)diazenyl] phenyl]hydrazinylidene]-6-[(2, 4-diaminophenyl)diazenyl]-4-oxonaphthalene-2-sulfonate; C.I. Direct Black 9 (VAN) (8CI); Pontamine Fast Black CN; Chrome Leather Black PLS; Phenamine Black FCW;disodium;