Agent Name

Cresol red

CAS Number

1733-12-6

Formula

C21-H18-O5-S

Major Category

Dyes

Synonyms

3',3''-Dimethylphenolsulfonephthalein; Cresol Red; Cresolsulfophthalein; o-Cresol Red; o-Cresolsulfonephthalein; Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis(2-methyl-; Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis(2-methyl-, S,S-dioxide (9CI); o-Cresol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide (8CI); [ChemIDplus]

Category

Indicator Dyes

Description

Reddish-brown solid; [Merck Index] Reddish-brown or green odorless solid; [CHEMINFO] Crystalline solid; [MSDSonline]

Sources/Uses

Used as acid-base indicator; [Merck Index] Color changes to red-yellow (pH 0.5-2.5) and orange-purple (pH 6.5-8.5); [Ullmann]

Comments

May cause irritation; [MSDSonline]

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