| NOUN | substance | azo dye | any dye containing one or more azo groups |
|---|
| Meaning | Any dye containing one or more azo groups. | |
|---|---|---|
| Narrower | congo red | A red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions) |
| methyl orange | An azo dye used as an acid-base indicator | |
| Broader | dye, dyestuff | A usually soluble substance for staining or coloring e.g. fabrics or hair |
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