direct dye

noun

1. any of a number of dyes that can be applied without the use of a mordant. They are usually azo dyes applied to cotton or rayon from a liquid bath containing an electrolyte such as sodium sulphate

Example Sentences

The direct dyes are so called because they dye cotton without the aid of any mordanting process.

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These three compounds are basic, and the first of them is no longer used as a direct dye because it is fugitive.

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In dealing with the first of the above groups of dyes, the direct dyes, the colourist is somewhat at a loss to explain in what manner the combination with the cotton fibre is brought about.

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Formerly the dyeing of these offered many difficulties before the application of the direct dyes was properly understood.

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Referring first to the wool patterns and to the "direct dyes," we find that the only really fast colors are Prussian blue and Vat indigo blue.

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