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

ETHYL RED

Synonyms:				2-(4-Diethylaminophenylazo)benzoic acid	

CAS No:					76058-33-8

Chemical Formula:				C17H19N3O2

Formula Weight:				297.36

Appearance:					Dark red to maroon powder 

Identification (IR):				To conform to structure

Melting Point:				~135 Deg. C (dec.)

Visual Transition Interval:		From pH 4.5  (red)
To      pH 6.5 (yellow)

Solubility:					Clear, dark red solution
 (1 mg/ml H2O)	

Residue on Ignition:			0.2% maximum			 

Effective: 01/16/09