azo pigment

Azo pigments are a large class of synthetic organic colorants characterized by the presence of the azo group (–N=N–) within their molecular structure. These pigments are insoluble and are used to color other materials by being finely ground into solid particles mixed with a liquid.12

Azo pigments are derived from aromatic hydrocarbons and account for most organic red, orange, and yellow pigments. They are synthesized through reactions involving diazonium salts and organic substances with replaceable hydrogen atoms. The development of azo dyes, a related class, revolutionized the synthetic dye industry, offering a wide color range, good fastness properties, and high tinctorial strength. Early applications involved forming the dye within the fiber itself.2341