Acid dyes

acid dye

noun Chemistry.
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.

Origin:
1885–90

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World English Dictionary
acid dye
 
n
a dye in which the chromophore is part of a negative ion usually applied from an acidic solution

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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.

The American Heritage® Stedman's Medical Dictionary
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