Definition of Congo red in English:

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Congo red

noun

A red-brown azo dye that becomes blue in acidic conditions, used as a chemical indicator and as a stain in histology.
Example sentences
  • The chemicals used in making Congo red and the other aniline dyes were primarily derived from the coal-tar waste products of the coal gas and steel industries in Germany's Ruhr Valley.
  • The presence of amyloid confirmed histologically by either Congo red or sulfonated Alcian blue stains or by electron microscopy was seen in 8 muscles.
  • Potassium permanganate incubation caused loss of reactivity with Congo red.

For editors and proofreaders

Syllabification: Con·go red

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