Products / pH Indicators

ALKALI BLUE Print Download

C.A.S. No. 1324-80-7
CI NO. 42765
M.W. 573.65 gm/mole


Solubility 0.1% ( Water) Clear solution
Absorption Maximum(Methanol) ? max. 593-613nm
Absorptivity (MeOH +1N 1ml HCl) >950
Dye content (by spectrophotometry) 50%
Loss on drying (110°C) <5%

Chemical Name

Sodium 4-((4-((4-amino-3-methylphenyl) (hydroxy) (4-(phenylamino) phenyl)methyl) phenyl) amino) benzenesulfonate

InChI Key



Soluble in water, alkali media

Product Description:

Alkali Blue is a pH indicator. Alternative names are Acid blue 119. It is one of the alkali-soluble triphenylmethane dyes that are essentially sodium salts of mono sulfonic acids of phenylated pararosaniline and are used chiefly in making printing inks. A class of blue pigment powders that are prepared from fuchsin, a synthetic red dye. By weight, alkali blue dyes have the highest tinting strength of any blue pigment


Used as a pH Indicator. It is a formidable stain for staining of proteins. Also used as a pigment for printing ink preparations. Also used for printing on acrylic fibres, paper and textile.

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