Used in the synthesis of azo dyes, particularly for producing red and orange shades in textile dyeing. Acts as a key intermediate in dye manufacturing due to its ability to form stable diazonium salts. Commonly employed in the production of direct dyes for cellulose fibers like cotton. Also utilized in the formulation of acid dyes for wool and silk, providing good lightfastness and color strength. Its sulfonic acid groups enhance water solubility, improving dye dispersion and application efficiency.