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Definition of alkali blue
1 : any of various alkali-soluble triphenylmethane dyes that are essentially sodium salts of monosulfonic acids of phenylated pararosaniline and are used chiefly in making pigments
2 : any of the fairly permanent pigments made from an alkali blue dye and used chiefly in printing inks
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Time Traveler for alkali blue
The first known use of alkali blue was in 1864
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