- 1. n. a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions) Source: wordnet
- 2. An artificial red dye from which the Congo group received its name. It is also widely used either in aqueous solution or as test paper (Congo paper) for the detection of free acid, which turns it blue. Source: webster
- 3. An artificial red dye from which the Congo group received itsname. It is also widely used either in aqueous solution or as testpaper (Congo paper) for the detection of free acid, which turns itblue. Source: adambom
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congo red
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