Specification Test Results

• Appearance:
  Dark red to red-brown to brown-black to orange-brown Powder
• Infrared spectrum:
  Conforms
• Visual transition interval:
  from pH 8.2(yellow to orange) to pH 10(green-bleu)
• Molar extinction coefficient:
  ≥50000 (0.01 g/l methanol) (207-213 nm)