Used primarily in the dye and pigment industry, it serves as an intermediate in the synthesis of various azo dyes, which are widely employed in textiles, paper, and leather coloring. Its sulfonic acid group enhances water solubility, making it suitable for dye formulations requiring good dispersion in aqueous solutions. Additionally, it finds application in the production of optical brighteners and certain pharmaceuticals, where its structural properties contribute to the desired chemical reactivity and stability.