Used primarily in the synthesis of azo dyes and pigments, especially for textiles and leather, due to its ability to form stable colorants. Also serves as a building block in the production of hair dyes, where it contributes to color development and fastness. Employed in the preparation of certain polyurethanes and epoxy curing agents, enhancing mechanical and thermal properties of resins. Additionally, it finds use in analytical chemistry as a reagent for detecting specific metal ions. Due to its potential neurotoxicity and carcinogenicity, its use is strictly controlled, especially in products that contact the human body.