Specification Test Results

• Appearance:
  White to almost white powder, eventually slightly yellowish.
• Identity (UV/VIS-Spectrum):
  passes test
• Absorption maximum λmax. (buffer pH 10.5):
  592 - 596 nm
• Spec. Absorptivity A 1%/1cm (λmax; 0.01 g/l; buffer pH 10.5; calculated on anhydrous substance):
  800 - 900
• Transition range (according to ACS):
  passes test
• Transition range:
  pH 9.0 - pH 10.5 colourless - blue
• Loss on drying (110 °C):
  ≤ 1 %