page_title: Azo dye
section_title: Azo pigments
hierarchical_section_title: Azo dye / Azo pigments
caption_attribution_description: English: re-corrected prep of Pigment yellow 12
context_page_description: Azo dyes are organic compounds bearing the functional group R−N=N−R′, in which R and R′ are usually aryl. They are a commercially important family of azo compounds, i.e. compounds containing the linkage C-N=N-C. Azo dyes are widely used to treat textiles, leather articles, and some foods. Chemically related to azo dyes are azo pigments, which are insoluble in water and other solvents.
context_section_description: Azo pigments are similar in chemical structure to azo dyes, but they lack solubilizing groups. Because they are insoluble in virtually all media, they are not readily purified, and thus require highly purified precursors.
  Azo pigments are important in a variety of plastics, rubbers, and paints (including artist's paints). They have excellent coloring properties, mainly in the yellow to red range, as well as good lightfastness. The lightfastness depends not only on the properties of the organic azo compound, but also on the way they have been absorbed on the pigment carrier.
caption: Synthesis of C.I. Pigment Yellow 12, an azo pigment (also classified as a diarylide pigment).
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