Specifications :

• Appearance of solution (2 g/l; NaOH 1 mol/l) : passes test
• Identity (UV/VIS-Spectrum) : passes test
• Absorption maximum λmax. (NaOH 0.05 mol/l) : 498 – 503 nm
• Spec. Absorptivity A 1%/1cm (λmax..; 0.005 g/l; NaOH 0,05 mol/l; calc. on dried substances) : 1000 – 1250
• Loss on drying (110 °C) : ≤ 7 %
• Suitability as indicator (for metal titration) : passes test