Specification Test Results

• Appearance (colour):
  Red to very dark red and red-brown and very dark red-brown
• Appearance (form):
  Powder or crystals
• Assay (gravimetr.):
  ≥80%
• Thin layer chromatogr.:
  Corresponds to standard
• Solubility (colour):
  Red to very dark red
• Solubility (turbidity):
  Report result
• Solubility (method):
  0.1 g in 10 ml water
• Loss on drying:
  ≤10%
• Wavelength (1) (UV):
  520 - 530 nm
• Extinction (1%/1 cm) (1) (UV):
  ≥800
• Solvent (UV):
  H₂O+1 ml 1% sodium carbonate