Formula: C₁₈H₁₄N₃NaO₃S CAS: 587-98-4 EC No.: 209-608-2 M (Molar Mass): 375.38 g/mol D (Density): ~1.0 g/cm³ (approx.) mp (Melting Point): Decomposes bp (Boiling Point): Not applicable pH Range: 1.2 (red) - 2.3 (yellow) (Acid-base indicator)

Assay (Colorimetric): Suitable for use as indicator. Appearance: Yellow to orange-brown powder. Identification (Color Change): Passes test (red in strong acid, yellow in weak acid). Solubility (in Water): Soluble, giving a yellow solution. Loss on Drying: ≤ 5.0 % Sensitivity Test (pH transition): Complies.