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Congo redOne entry found. Main Entry: Con·go red Pronunciation: \ˈkäŋ-(ˌ)gō-\ Function: noun Etymology: Congo, territory in Africa Date: 1885 : 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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