azo dye

Other forms: azo dyes

Definitions of azo dye

1. noun

   any dye containing one or more azo groups
   types:

   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; used for titrations involving weak bases

   type of:

   dye, dyestuff

   a usually soluble substance for staining or coloring e.g. fabrics or hair