NILE CHEMICALS

CRESOL RED

SPECIFICATION SHEET

CAS No. 1733-12-6
Chemical Formula C21H18O5S
Molecular Weight 382.43
Melting Point 290° c
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° c.) < 5%

Also Available Cresol Red Sodium Salt Cas no 62625-29-0

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