Acid dye

any of a class of dyes containing one or more acidic groups, as the sulfo group: used in acid solution chiefly for dyeing wool and silk.
Historical Examples

If there is a precipitate there is a basic dye, if not, an acid dye.
The Manufacture of Paper Robert Walter Sindall

The goods may advantageously be bottomed with an acid dye or a dye-wood extract, and then finished with basic dyes.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 3 Various

a dye in which the chromophore is part of a negative ion usually applied from an acidic solution

acid dye n.
Any of a class of dyes that contain acidic groups, usually in the form of sodium or potassium salts, and are used in staining cytoplasm and various acidophilic structures of cells or tissues. Also called acid stain.

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    noun a technique for engraving blown or cast glass or a metal by the use of an acidic substance; esp. the use of hydrofluoric acid to etch a pattern onto a glass or metal surface Examples Acid etching craft kits are now available, making the process simple and fun. Word Origin by 1873 Historical Examples […]

  • Acid-fast

    resistant to decolorizing by acidified alcohol after staining. Historical Examples The acid-fast bacteria are particularly rich in fatty substances, especially the higher wax-like fats. The Fundamentals of Bacteriology Charles Bradfield Morrey Other bacteria than the acid-fast group are stained blue by Gabbet’s method. A Manual of Clinical Diagnosis James Campbell Todd This method is supposed […]

  • Acid-forming

    yielding acid in chemical reaction; acidic. (of food) containing a large amount of acid ash after complete oxidation. Historical Examples The desirable type of acid-forming bacteria do not form spores; hence, are easily killed by heating the milk. Outlines of dairy bacteriology H. L. Russell The fermentation which produces acid and the diffusion of acid-forming […]

  • Acid fuchsin

    acid fuchsin acid fuchsin n. An acid dye used as an indicator and as a stain for cytoplasm and collagen.

  • Acid freak

    acid freak n phr,n A person who uses LSD, esp one who uses the drug heavily or habitually: He has suggested that some of our recent Presidents were acidheads (Narcotics)

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