Formula: C₁₆H₁₀N₂Na₂O₇S₂ CAS: 1936-15-8 EC No.: 217-705-6 M (Molar Mass): 452.37 g/mol D (Density): ~1.00 g/cm³ mp (Melting Point): Not applicable bp (Boiling Point): Not applicable Optical Rotation: Not applicable

Concentration: Typically 0.5 – 1.0 % w/v (for Papanicolaou staining) Appearance: Orange-yellow aqueous solution pH: 4.0 – 6.0 Dye Content: ≥ 90% of stated concentration Absorbance Maximum: ~475 nm Clarity: Clear solution Staining Performance: In Papanicolaou stain, stains keratinized cells orange Packaging: Typically in dropper bottles or larger volumes