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

NEUTRAL RED, 90%

Synonyms:					C.I. 50040; Basic Red 5; Toluylene red.

CAS No:					553-24-2

Chemical Formula:				C15H17CIN4

Formula Weight:				288.78

Description:					Very dark-green to blackish-brown powder

Lambda max					540 nm 
(In 50% Ethanol + .5 ml Acetic Acid)

Assay:						90% minimum

Loss on drying at 110 deg.C/1hr:		8 % maximum

Visual Transition Interval			From pH 6.8 (red) 
To     pH 8.0 (yellow)

Solubility 0.1%:				Clear red solution 
 in 50% EtOH + 2 ml Acetic acid)

Absorptivity 1% / 1 cm (50%
EtOH + Acetic Acid) at
Lambda max. 541.0 nm:			1370 - 1520

Effective: 01/05/09