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Congo red


Con·go red

noun \ˈkäŋ-(ˌ)gō-\

Definition of CONGO RED

: an azo dye C32H22N6Na2O6S2 that is red in alkaline and blue in acid solution and that is used especially as an indicator and as a biological stain
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Origin of CONGO RED

Congo, territory in Africa
First Known Use: 1885

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