C16H18ClN3S·H2O
C.I. Basic Blue 9, Tetramethylthionine Chloride
M.W: 319.85 CAS: 122965-43-9 EC: 200-515-2
H: H302 
- Appearance Red-brown powder
- Assay ≥ 82%
- Loss on drying 8 – 16%
- Absorption maximum in water (H2O) 663 – 667nm
- Absorptivity (A1%; 1cm; water) ≥ 2200
- Coefficient maximum of absorption (P*15 nm) 1.21 – 1.7
- TLC test Passes test
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