Dye content (spectrophotometrically): ≥ 75 %

Identity (UV/VIS-Spectrum): passes test

Transition range: pH 6.8 - pH 8.0 Violet red - orange yellow

Absorption maximum λmax. (ethanol 50 %): 540 - 543 nm

Absorption maximum λ 1 (buffer pH 6.8): 514 - 519 nm

Absorption maximum λ 2 (buffer pH 8.0): 452 - 455 nm

Spec. Absorptivity A 1%/1cm (λmax; 0.005 g/l; ethanol 50 %): 1180 - 1610

Spec. Absorptivity A 1%/1cm (λ1max; 0.015 g/l; buffer pH 6.8; calc. on dried substances): 425 - 575

Spec. Absorptivity A 1%/1cm (λ2max; 0.015 g/l; buffer pH 8.0; calc. on dried substances): 395 - 535

TLC-Test: passes test

Loss on drying (110 °C): ≤ 18 %

Suitability for microbiology: passes test