Used primarily in the dye and pigment industry, it serves as an intermediate for the synthesis of various azo dyes, which are widely applied in textiles, paper, and leather coloring. Its sulfonic acid group enhances water solubility, making it suitable for aqueous dye formulations. Additionally, it is utilized in the production of optical brighteners and as a coupling agent in chemical reactions to create complex organic compounds. In analytical chemistry, it acts as a reagent for detecting specific ions or compounds due to its reactive properties.