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Eriochrome blue-black B (C.I. 14640) metal indicator. CAS 3564-14-5, pH 9.5 (10 g/l, H₂O, 20 °C), Hill Formula C₂₀H₁₃N₂NaO₅S. Eriochrome blue-black B (C.I. 14640) MSDS (SDS) and safety info here. Synonyms: 2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-naphthalene-4-sulfonic acid sodium salt
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