Specifications :

• Dye content (spectrophotometrically) : ≥ 95 %
• Identity
  – Hydrogen sulfate (as sulfur) : passes test
  – UV/VIS-Spectrum : passes test
• Absorption maximum λ max (ethanol 50 %) : 628 – 632 nm
• Spec. Absorptivity A 1%/1cm (λmax; 0.003 g/l; ethanol 50 %) : 2210 – 2350
• TLC-Test : passes test
• Loss on drying (110 °C) : ≤ 5 %
• Suitability for microscopy : passes test