Used as an intermediate in the synthesis of dyes and pigments, particularly for azo dyes that require water solubility and stability. It acts as a coupling component in colorant formulations for textiles, paper, and leather due to its strong affinity for cellulose-based materials. Also employed in the preparation of fluorescent whitening agents for detergents and plastics. Its sulfonate groups enhance solubility and dispersion in aqueous systems, making it suitable for industrial applications requiring uniform coloring. Additionally, it finds use in analytical chemistry as a derivatizing agent for detecting amines and phenols through visible color formation.