Formula: C₂₂H₂₅ClN₂ (as Pararosaniline derivative, chloride salt) CAS: 3248-91-7 EC No.: 221-831-7 M (Molar Mass): 366.90 g/mol (approx., for basic fuchsin mixtures) D (Density): ~1.0 g/cm³ (approx.) mp (Melting Point): Decomposes bp (Boiling Point): Not applicable Optical Rotation: Not applicable

Assay (Dye Content, Spectrophotometric): ≥ 75.0 % Appearance: Green metallic luster powder or crystals. Identification (Staining): In acid-fast staining (e.g., for Mycobacteria), produces a bright red color. Solubility (in Water/Ethanol): Passes test (red solution). Loss on Drying: ≤ 5.0 % Suitability for Staining: Complies with histological staining tests.