METHYL RED INDICATOR AR

Short Name: METHYL RED INDICATOR

Other Names: 2-(N,N-Dimethyl-4-aminophenyl)azobenzenecarboxylic acid, C.I. Acid Red 2

C.I.No.13020

Chemical Specifications

Appearance : Dark red to maroon to violet or purple powder or crystals

Identity : Passes test

pH transition range (4.4 - 6.2) : Pink Red – yellow orange

Insoluble matter in ethanol (1 g/L) : Passes test

Absorption maxima (buffer pH 4.5) : 523 - 526 nm

Absorption maxima (buffer pH 6.2) : 427 - 437 nm

Loss on drying (at 110°C) : Max 5.0%

Residue on ignition (as SO4) : Max 2.0%