Used as an intermediate in the synthesis of dyes, particularly for coloring textiles and paper. It plays a role in the production of reactive dyes that bond strongly with fibers, ensuring colorfastness. Also employed in analytical chemistry as a reagent for detecting specific functional groups in organic compounds. Its sulfonic acid group enhances solubility in water, making it suitable for aqueous-based applications. Additionally, it finds use in biochemical research for studying enzyme inhibition and redox reactions due to its quinone structure.