Disodium 2-naphthol-3,6-disulfonate is primarily used as an intermediate in the synthesis of dyes and pigments, particularly azo dyes, which are widely employed in the textile industry for coloring fabrics. Its sulfonate groups enhance water solubility, making it suitable for dyeing processes in aqueous solutions. Additionally, it serves as a coupling agent in the production of reactive dyes, ensuring strong bonding with fibers like cotton, wool, and silk. Beyond textiles, it finds application in the paper industry for coloring paper products and in the manufacturing of inks for printing. Its ability to form stable complexes also makes it useful in analytical chemistry as a reagent for detecting and quantifying certain metal ions.