Widely used in the dye and pigment industry as an intermediate for producing azo dyes, which are essential for coloring textiles, paper, and leather. Its sulfonic acid groups enhance water solubility, making it suitable for dye formulations that require bright and stable colors. Additionally, it serves as a coupling agent in organic synthesis, facilitating the creation of complex chemical structures. In analytical chemistry, it is employed as a reagent for detecting and quantifying specific metal ions due to its chelating properties. Its versatility and reactivity make it valuable in various industrial and laboratory applications.