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Identity (UV/VIS-Spectrum) passes test

1st transition range pH 4.3 - pH 6.3 Lightly yellow - pink

2nd transition range pH 9.4 - pH 12.0 Brown orange - violet

Absorption maximum λ 1 (buffer pH 4.3) 418 - 424 nm

Absorption maximum λ 2 (buffer pH 6.3) 510 - 517 nm

Absorption maximum λ 3 (buffer pH 9.4) 444 - 450 nm

Absorption maximum λ 4 (buffer pH 12.0) 554 - 558 nm

Spec. Absorptivity A 1%/1cm (λ1max; 0.01 g/l; buffer pH 4.3; calc. on dried substance) 135 - 180

Spec. Absorptivity A 1%/1cm (λ2max; 0.01 g/l; buffer pH 6.3; calc. on dried substance) 145 - 210

Spec. Absorptivity A 1%/1cm (λ3max; 0.01 g/l; buffer pH 9.4; calc. on dried substance) 170 - 230

Spec. Absorptivity A 1%/1cm (λ4max; 0.01 g/l; buffer pH 12.0; calc. on dried substance) 340 - 520

Loss on drying (110 °C) ≤ 10 %