Specification Test Results

• Green to red-brown to brown powder:
  Passes test
• Solubility in ethanol (0.1 %):
  Clear solution
• Visual transition interval :
  pH 4.8 - pH 6.4
• Loss on drying:
  ≤ 8.0 %
• Absorption max. λ (0.1 mol/l NaOH):
  572 - 575 nm
• Absorptivity (1 %; 1 cm; λmax):
  ≥ 1000