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3 definitions found

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 Congo red /ˌkɑŋ(ˌ)goˈrɛd/ 名詞

From: Webster's Revised Unabridged Dictionary (1913)

 Congo red. Chem. 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.
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From: WordNet (r) 2.0

 congo red
      n : a red-brown azo dye especially as a chemical pH indicator
          (congo red is red in basic and blue in acidic solutions)