alkali blue

noun

Definition of alkali blue

  1. 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. 2 :  any of the fairly permanent pigments made from an alkali blue dye and used chiefly in printing inks

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First Known Use of alkali blue

1864


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