Agent Name

Methyl Red

CAS Number

493-52-7

Formula

C15-H15-N3-O2

Major Category

Dyes

Synonyms

2-((4-Dimethylamino)phenylazo)benzoic acid; 2-Carboxy-4'-(dimethylamino)azobenzene; 4'-Dimethylaminoazobenzene-2-carboxylic acid; 4-Dimethylamino-2'-carboxylazobenzene; Benzoic acid, 2-((4-dimethylamino)phenylazo)-; Benzoic acid, o-((p-(dimethylamino)phenyl)azo)-; C.I. 13020; C.I. Acid Red 2; CI 13020; CI Acid Red 2; Cerven kysela 2 [Czech]; Cerven methylova [Czech]; Dimethylaminoazobenzene-2-carboxylic acid; Methyl Red; o-((p-(Dimethylamino)phenyl)azo)benzoic acid; o-Methyl red; p-(Dimethylamino)azobenzene-o-carboxylic acid; 2-(4-Dimethylaminophenylazo)benzoic acid; [ChemIDplus]

Category

Azo Dyes

Description

Violet crystals; [Sax]

Sources/Uses

Used as a pH indicator for the pH range of 4.4-6.2; [Ullmann]

Comments

Animal testing inadequate; No human data; [IARC] May be toxic by ingestion and inhalation; May cause serious eye injury; [MSDSonline]

Exposure Assessment
Vapor Pressure

1.44E-7 mm Hg

Adverse Effects
IARC Carcinogen

Not Classifiable

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