3-Hydroxy-4-[(2-hydroxy-1-naphthalenyl)azo]-7-nitro-1-naphthalenesulfonic acid sodium salt;Eriochrome black A (Mordant-black 1);SodiuM 3-hydroxy-4-[(2-hydroxy-1-naphthyl)diazenyl]-7-nitronaphthalene-1-sulfonate;CHROME BLACK A;CI 15710;CI NO 15710;DIAMOND BLACK;ERIOCHROME BLACK A