congo red

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Definitions from WordNet

Noun congo red has 1 sense

congo red - a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
--₁ is a kind of azo dye; acid-base indicator

Definitions from the Web

Congo Red

Noun:

1. A synthetic azo dye that is used as a pH indicator and for staining biological tissues.

Example sentence: The biologist used Congo Red to stain the cells under the microscope.

Adjective:

1. Referring to or being a color similar to that of Congo Red or a material dyed with it.

Example sentence: She bought a lovely Congo Red dress for the party.

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