Methylene blue (C.I. 52015) IND

C₁₆H₁₈ClN₃S·H₂O
C.I. Basic Blue 9, Tetramethylthionine Chloride
M.W: 319.85 CAS: 122965-43-9 EC: 200-515-2 TARIC: 32041300

H: H302

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Appearance ? Dark blue, crystalline powder with a copper-coloured sheen, or green crystals with a bronze-coloured sheen
Assay 95.0 – 101.0%
Identity ? passes test
Solubility ? passes test
Methanol insoluble subtances ? 1.0%
Related substances ? passes test
Iron (Fe) ? 0.02%
Lead (Pb) ? 0.001%
Zinc (Zn) ? 0.01%
Sulphated ash (at 600ºC) ? 1.0%
Loss on drying (105 °C) 8.0 – 22.0%