Formula: C₂₀H₁₁N₂Na₃O₁₀S₃ Color Index: Food Red 9, CI 16185 CAS: 915-67-3 EC No.: 213-022-2 M (Molar Mass): 604.48 g/mol Appearance: Red to maroon powder

Dye Content: ≥ 85%. Appearance: Red to maroon powder. Solubility: Soluble in water (red-violet solution), insoluble in ethanol. pH (1% solution): 6.5-8.0. Loss on Drying: ≤ 10.0%. Residue on Ignition: 25-30% (as sodium sulfate). Heavy Metals (as Pb): ≤ 20 ppm. Arsenic (As): ≤ 3 ppm. Lead (Pb): ≤ 10 ppm. Subsidiary Dyes: ≤ 3.0%. Intermediate Compounds: ≤ 0.5%. Unsulfonated Aromatic Amines: ≤ 0.01%.