Azo dye

Azo dyes are organic compounds bearing the functional group R−N=N−R′, in which R and R′ are usually aryl and substituted aryl groups. They are a commercially important family of azo compounds, i. e.

compounds containing the C−N=N−C linkage.
Azo dyes are synthetic dyes and do not occur naturally.
Most azo dyes contain only one azo group but there are some that contain two or three azo groups, called "diazo dyes" and "triazo dyes" respectively.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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