Used primarily as an intermediate in the production of dyes and pigments, particularly azo dyes, which are widely applied in textiles, paper, and leather industries. It also serves as a key component in the synthesis of fluorescent whitening agents, enhancing the brightness of materials like detergents and papers. In analytical chemistry, it is utilized as a reagent for detecting and quantifying specific metal ions due to its ability to form colored complexes. Additionally, it finds application in the preparation of certain pharmaceuticals and organic compounds, contributing to the development of active ingredients or additives in medicinal formulations.