SPECIFICATIONS

CRESOL RED FREE ACID

Synonyms:					o-Cresolsulfonphthalein

CAS No:					1733-12-6

Chemical Formula:				C21H18O5S

Formula Weight:				382.43

Appearance:					Green to Maroon-Red to Dark Brown Powder

Assay:						95% minimum

Visual Transition Intervals		pH 0.2 (pink) to pH 2.0 (yellow)
						pH 7.2 (yellow) to pH 8.8 (red-purple)

Loss on Drying:				3% Maximum

Solubility 0.1%				Clear yellow solution.
(95% EtOH)

Effective Date: 12/06/17