Widely used in the textile industry as a dye intermediate, particularly in the production of vat dyes for cotton and other cellulosic fibers. It imparts excellent light and wash fastness to fabrics. Commonly employed in the synthesis of sulfur dyes and indigo derivatives, enhancing dye solubility and dispersion in aqueous systems. Also utilized in electroplating processes as a brightening agent due to its ability to refine metal surface finish. Finds use in analytical chemistry as a complexing agent for the detection of certain metal ions. Its sulfonate groups improve water solubility, making it suitable for liquid formulations in industrial applications.