Definition of Congo red in English:

Congo red

Syllabification: Con·go red


  • A red-brown azo dye that 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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Pronunciation: ˈtôrtē
a tortoiseshell cat