Used as an intermediate in the synthesis of azo dyes and pigments, particularly for producing bright red and scarlet shades. Commonly employed in the textile industry for dyeing cotton, wool, and silk due to its strong affinity for cellulose fibers. Also utilized in the production of lake pigments for inks, paints, and colorants where high color strength and lightfastness are required. Its sulfonic acid groups enhance water solubility, making it suitable for aqueous dyeing processes. Additionally, it serves as a coupling component in the manufacture of direct and acid dyes.