HyperDic: congo_red

English > 1 sense of the expression congo red:
NOUNsubstancecongo reda red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
English > congo red: 1 sense > noun 1, substance
MeaningA red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions).
CategorysolutionA homogeneous mixture of two or more substances
Broaderacid-base indicatorAn indicator that changes color on going from acidic to basic solutions
azo dyeAny dye containing one or more azo groups

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