Description Pyronin Y, 55% (Dye Content), 1g For Research & Development Not for drug, human, animal, or food use Certificate of Analysis: Appearance (Color) Violet Appearance (Form) Powder Assay (Dye Content) 55.0% Absorbance OD535/OD565 1.47 Infrared Spectrum Conforms to structure UV/VIS max (50% ethanol) 550nm CAS: 92-32-0 FORMULA: C17H19ClN2O