Definition of Congo red in English:

Congo red

Line breaks: Congo red

noun

[mass noun]
A red-brown azo dye which becomes blue in acidic conditions, used as a chemical indicator and as a stain in histology.
More 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.

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