Used as an intermediate in the production of dyes and pigments, particularly for coloring textiles and paper. It plays a key role in synthesizing azo dyes, which are known for their vibrant colors and strong adhesion to fabrics. Also employed in the manufacturing of fluorescent brightening agents, enhancing the appearance of materials like plastics and detergents. In analytical chemistry, it serves as a reagent for detecting and quantifying specific compounds. Its water-soluble nature makes it suitable for use in aqueous solutions and industrial processes.