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Organic Indicator
Biological Dye
methyl red
chemical net
Methyl Red

Methyl Red

Methyl Red


Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1. Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants.Methyl red is classed by the IARC in group 3 - unclassified as to carcinogenic potential in humans.
Synonym: 2-(4-Dimethylaminophenylazo)benzoic acid, 4-Dimethylaminoazobenzene-2′-carboxylic acid, Acid Red 2

Grade:AR Grade

Purity:99% min

CAS Number :493-52-7

EC Number :207-776-1

Molecular Formula:C15H15N3O2

Linear Formula:(CH3)2NC6H4N=NC6H4CO2H

Technical Requirements:


Methyl Red

Appearance Red-brown or Purple Crystal Powder
PH Range  4.5 - 6.2, red to yellow
Ignition Residue (w/%) 0.2% max
Loss on Drying (w/%) 1.0% max
Solubility in Ethanol Qualified


Used as acid-base indicator;
adsorption indicator

Packing:25g/bottle or according to your requirement.

How to buy Methyl Red

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