Specifications :

• Identity (UV/VIS-Spectrum) : passes test
• Appearance of solution (1 g/l; water) : passes test
• Transition range : pH 3.0 – pH 5.2 violet – orange-red
• Absorption maximum λ 1 max. (buffer pH 3.0) : 563 – 568 nm
• Absorption maximum λ 2 max. (buffer pH 5.2) : 484 – 489 nm
• Spec. Absorptivity A 1%/1cm (λ 1 max.; 0.01 g/l; buffer pH 3.0; calc. on dried substances) : ≥ 150
• Spec. Absorptivity A 1%/1cm (λ 2 max.; 0.01 g/l; buffer pH 5.2; calc. on dried substances) : ≥ 200
• Loss on drying (110 °C) : ≤ 5 %
• Sensitivity test : passes test