alkali blue

noun

Chemistry.

1. any of the class of blue pigments having the highest tinting strength, by weight, of all known blue pigments: used chiefly in the manufacture of printing inks.

Example Sentences

The company says the facility is exclusively dedicated to making alkali blue, a pigment used in magazine and book printing.

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In the application of so-called Alkali Blue the process of dyeing in an acid bath is impossible, owing to the insolubility of the colour-acid in an acid solution.

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Alkali Blue 6 B, indicator, 129.

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In such cases about 2 cubic centimeters of a 2 per cent. alcoholic solution of Alkali Blue 6 B is recommended.

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The basic and slightly soluble spirit blue was by this means converted into acid blues, which are now made in large quantities, and sold under the names of Nicholson’s blue, alkali blue, soluble blue, and other trade designations.

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