Description Eriochrome Black T, ACS, 100g For Research & Development Not for drug, human, animal, or food use Specifications: Appearance (Color) Brownish-black Appearance (Form) Powder Loss on Drying <7% Absorptivity 1%/1cm (at pH 10 Ammonia Buffer + 2ml 0.05 EDTA solution) at ƛ max. 623.6 nm >320 Clarity of Solution Passes Test Suitability as Complexometric Indicator Passes Test CAS: 1787-61-7 FORMULA: C20H12N3NaO7S