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Congo red

noun

, Chemistry.
  1. a water-soluble powder, C 32 H 22 O 6 N 6 S 2 Na 2 , one of the Congo colors that is not acid-fast or lightfast: used chiefly as a dye, biological stain, and chemical indicator.

Congo red

noun

  1. a brownish-red soluble powder, used as a dye, a diagnostic indicator, a biological stain, and a chemical indicator. Formula: C 32 H 22 N 6 O 6 S 2 Na 2

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Word History and Origins

Origin of Congo red1

First recorded in 1880–85

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CongoleseCongo, Republic of the

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