Widely 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 and durable colors. Additionally, it is utilized in the manufacturing of fluorescent brightening agents, enhancing the whiteness and brightness of materials like fabrics and detergents. In analytical chemistry, it serves as a reagent for detecting and quantifying specific metal ions due to its ability to form colored complexes. Its water-soluble nature makes it suitable for applications in aqueous solutions, contributing to its versatility in industrial processes.