S P E C I F I C A T I O N S

THYMOL BLUE FREE ACID ACS

Synonyms:				TB; Thymolsulfonephthalein

CAS No:					76-61-9

Formula:					C27H30O5S

F.W.:						466.60

Appearance:					Dark-Green to brown to red-brown to purple crystalline powder

Clarity of solution				To pass test

Melting Point:				221 - 224 deg. C

Visual transition interval			pH 1.2 (red) to pH 2.8 (yellow)
(acid range)

Visual transition interval			pH 8.0 (yellow) to pH 9.2 (blue)
(alkaline range)

Loss on drying
(at 110 Deg. C/1hr)				< 5.0%

Effective: 12/16/08