Specifications :

• Identity (UV/VIS-Spectrum) : passes test
• Clarity of solution in water : passes test
• Clarity of the solution in Ethanol : passes test
• Transition range : pH 4.5 – pH 6.2 red violet – brownish yellow
• Absorption maximum λ 1 max. (buffer pH 4,5) : 523 – 526 nm
• Absorption maximum λ 2 max. (buffer pH 6,2) : 430 – 438 nm
• Spec. Absorptivity A 1%/1cm (λ 1 max.; 0.005 g/l; buffer pH 4,5; calc. on dried substances) : 1000 – 1400
• Spec. Absorptivity A 1%/1cm (λ 2 max.; 0.005 g/l; buffer pH 6,2; calc. on dried substances) : 560 – 740
• Loss on drying (110 °C) : ≤ 5 %
• Transition range (according to ACS) : passes test