Analysis Note

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 (λ1_max; 0.01 g/l; buffer pH 4.3; calc. on dried substance): 135 - 180

Spec. Absorptivity A 1%/1cm (λ2_max; 0.01 g/l; buffer pH 6.3; calc. on dried substance): 145 - 210

Spec. Absorptivity A 1%/1cm (λ3_max; 0.01 g/l; buffer pH 9.4; calc. on dried substance): 170 - 230

Spec. Absorptivity A 1%/1cm (λ4_max; 0.01 g/l; buffer pH 12.0; calc. on dried substance): 340 - 520

Loss on drying (110 °C): ≤ 10 %

General description

for analysis and indicator

Packaging

100 g in Glass bottle