Specification Test Results

• Appearance:
  Golden to orange Powder
• Infrared spectrum:
  Conforms
• Dye content:
  ≥88 %
• UV Lambda max:
  413 to 419 nm (in methanol)
• Specific absorbance A (1%/1cm):
  ≥400
• Visual transition interval:
  from pH 1.2 (red) to 2.3 (yellow)