Formula: C₁₀H₅NaO₅S CAS: 521-24-4 EC No.: 208-306-6 M (Molar Mass): 260.20 g/mol D (Density): ~1.0 g/cm³ (approx.) mp (Melting Point): >300 °C (dec.) bp (Boiling Point): Not applicable Optical Rotation: Not applicable

Assay (UV-Vis/Titration): ≥ 97.0 % Appearance: Yellow to orange crystalline powder. Identification (Color Reaction): With primary amines (e.g., amino acids), produces a characteristic orange to red color (Folin reaction). Solubility (in Water): Passes test (yellow solution). Loss on Drying: ≤ 0.5 % Suitability for Amino Acid Detection: Complies with test.