Eriochromblauschwarz R, 1-(2-hydroxynaphthylazo)-2-naphthol-4-sulphonic acid, calcon, 3-Hydroxy-4-(2-hydroxy-naphthalen-1-ylazo)-naphthalene-1-sulfonic acid, Palatine Chrome Black 6BN, 3-hydroxy-4-[(2-hydroxy-1-naphthyl)azo]-1-naphthalenesulfonic acid, 1-(2-hydroxy-1-naphthyldiazen-1-yl)-2-naphthol-4-sulfonic acid
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