Acid dust

air-polluting particles of dust, usually wind-borne, having high concentrations of acid.


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  • 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 […]

  • Acid etching

    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 […]

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