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 WordNet Dictionary |
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| | Definition: | |
[n] a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions) |
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| | See Also: | | acid-base indicator, azo dye |
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| Webster's 1913 Dictionary |
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| | Definition: | | \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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