noun, Chemistry.
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.
a brownish-red soluble powder, used as a dye, a diagnostic indicator, a biological stain, and a chemical indicator. Formula: C32H22N6O6S2Na2

Congo red Con·go red (kŏng’gō)
An acid dye used as an indicator in testing for free hydrochloric acid in gastric contents, as a laboratory aid in the diagnosis of amyloidosis, and as a histologic stain for amyloid.


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