(b) azo dyes
Bismarck brown is an example of an azo dye. Azo dyes are a class of synthetic dyes that contain one or more azo (-N=N-) functional groups. They are widely used in the textile industry for dyeing fabrics and in various other applications due to their vibrant colors and easy synthesis. Bismarck brown, specifically, is a brown-colored azo dye commonly used in histology and staining biological samples.
