Specifications :

• Dye content (spectrophotometrically) : ≥ 50 % C₂₇H₃₅BrClN₃
• Identity
  – Bromide : passes test
  – chloride : passes test
  – Zinc : passes test
  – UV/VIS-Spectrum : passes test
• Absorption maximum λ max (water) : 630 – 635 nm
• Spec. Absorptivity A 1%/1cm (λmax; 0.005 g/l; water) : ≥ 810
• Crystal violet : ≤ 4 %
• TLC-Test : passes test
• Loss on drying (50 ° C/0.05 mm Hg/ 3h) : ≤ 5 %
  Suitability for microscopy : passes tes