Specification Product Name TOLUIDINE BLUE Synonyms Basic Blue 17; Toloniumchloride; TBO CAS NO. 92-31-9 C.I. NO. 52040 Molecular Formula C15H16 CIN3S Formula Weight 305.83 Appearance Dark greenish black powder Structure     Tests    Limits Solubility 0.1% (dist. Water) Clear blue solution Absorptivity 1%/1cm, at λ max.631.0nm - Clear blue solution   - >1200 Dye content (by spectrophotometry) - >80% Loss on drying at (110°C) - < 8%         REVISED: 1-1-2012