Specifications :

• Dye content (spectrophotometrically) : ≥ 60% C₁₇H₂₀N₃O
• Identity
  – UV/VIS-Spectrum : passes test
  – Zinc : passes test
• Absorption maximum λ max (ethanol 50 %) : 623 – 628 nm
• Spec. Absorptivity A 1%/1cm (λmax; 0.005 g/l; ethanol 50 %) : ≥ 1500
• TLC-Test : passes test
• Loss on drying (110 °C) : ≤ 5 %
• Suitability for microscopy : passes test