Used primarily as an intermediate in the synthesis of dyes and pigments, particularly for coloring textiles, paper, and leather. It plays a key role in producing azo dyes, which are known for their vibrant colors and strong binding properties. Additionally, it is utilized in the preparation of certain pharmaceuticals and organic compounds, where its sulfonic acid group enhances solubility and reactivity. Its applications extend to industrial processes where precise chemical modifications are required for specialized products.