Used primarily as a dye intermediate in the production of hair dyes and textile dyes. It is a key component in permanent hair coloring products, providing long-lasting color by forming polymers upon oxidation. Also employed in the manufacture of black rubber and plastics, where it acts as an antioxidant and stabilizer. In addition, it serves as a raw material for synthesizing azo dyes, which are widely used in the printing and textile industries. Due to its strong coloring properties, it is also utilized in the production of inks and photographic developers.