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CAS 3564-14-5 — Eriochrome blue black B (C.I. 14640)

Eriochrome Blue Black B (C.I. 14640) is a triarylmethane dye used primarily as a metal indicator in complexometric titrations, particularly for calcium and magnesium analysis. It forms wine-red complexes with these metals, enabling precise endpoint detection in analytical chemistry. CAS 3564-14-5, molecular formula C₂₀H₁₃N₂NaO₅S, molecular weight 416.3824. Stored at ambient conditions with no signal word required. Molekula supplies Eriochrome Blue Black B from research to bulk quantities with full documentation and ISO 9001:2015 traceability.