Used primarily as a diazo component (bis-diazonium equivalent) in the production of azo dyes, it decomposes under mildly acidic conditions to generate two equivalents of 4-sulfophenyldiazonium ions, which couple with suitable coupling agents to form stable bis-azo dyes essential for vibrant and long-lasting colors in textiles and fabrics. Its role in dye synthesis ensures improved color fastness and resistance to fading. Additionally, it finds application in the preparation of pigments for inks and coatings, enhancing their durability and performance. In research, it serves as a reagent for studying diazo coupling reactions and their mechanisms. Its water-soluble nature makes it suitable for use in aqueous dyeing processes, contributing to environmentally friendly production methods.