Formula: C₂₀H₁₂N₃NaO₇S CAS: 1787-61-7 EC No.: 217-250-6 M (Molar Mass): 461.38 g/mol Color: Black powder pH Transition: Wine red to blue at pH 10 Use: Indicator for EDTA titrations of calcium, magnesium

Dye Content: ≥ 85% Appearance: Black powder Indicator Performance: Sharp color change at pH 10 Loss on Drying: ≤ 5.0% Solubility in Water: ≥ 95% soluble Ash Content: ≤ 15% Heavy Metals (as Pb): ≤ 50 ppm Sensitivity: Detects 0.01 mmol/L Ca²⁺ or Mg²⁺ pH Range: 9.5-10.5 for optimal performance Stability: Stable as dry powder