| NOUN | substance | congo red | 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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| Meaning | 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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| Category | solution | A homogeneous mixture of two or more substances |
| Broader | acid-base indicator | An indicator that changes color on going from acidic to basic solutions |
| azo dye | Any dye containing one or more azo groups | |
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