Cresol Red

CAS No.

1733-12-16

Chemical Formula

C₂₁H₁₈O₅S

Molecular Weight

382.43

Melting Point

290 ^oC

Dye Content

~95%

Transition Range

pH 0.5 - pH 1.8
Pink to Yellow
pH 7.2 - pH 8.8
Yellow to Purple

Absorptivity(pH 0.5)517 - 520 nm

1180 - 1230

Absorptivity(pH 2.5)432-436 nm

490-540

Absorptivity(pH 6.5)432 - 436 nm

490 - 540

Absorptivity(pH 8.5)571 - 574 nm

1000 - 1050

Loss On Drying (110^oC.)

< 5%