Specification Test Results

• Appearance:
  Pink-orange to red Powder
• Infrared spectrum:
  Conforms
• Solubility:
  (0.1 % in ethanol) Clear
• Specific extinction E (1%/1cm):
  ≥1100 (592 nm, in buffer)
• Visual transition interval:
  from pH 3.0 (yellow) to pH 4.6 (blue)