Used in the production of dyes and pigments, particularly azo dyes, which are valued for their vibrant colors and used in textiles, inks, coatings, and cosmetics. It serves as an intermediate in the synthesis of certain pesticides, fungicides, pharmaceuticals, and antioxidants. Also employed in the manufacture of rubber chemicals to improve reinforcement, durability, and protection against light and oxygen. Additionally, it finds use in analytical chemistry as a reagent for detecting specific ions, such as aromatic amines, through color-forming reactions, and in histology for staining biological samples. It is also utilized in biochemical research to study enzyme functions and protein reactions.