Used as a dye intermediate in the textile industry, particularly for producing vat dyes. It imparts bright red to blue shades on cotton and other cellulosic fibers. Also employed in the synthesis of high-fastness dyes for industrial fabric coloring. Its sulfonate group enhances water solubility, aiding in uniform dye dispersion during processing. Applied in printing inks and sometimes in specialty paper dyes due to its stability and strong color yield.