This chemical is primarily used as an intermediate in the synthesis of dyes and pigments, particularly in the production of azo dyes. Its structure allows it to act as a coupling agent, enabling the formation of complex dye molecules with enhanced colorfastness and stability. It is also employed in the textile industry for dyeing fabrics, where it contributes to vibrant and long-lasting colors. Additionally, it finds application in the preparation of optical brighteners, which are used to improve the whiteness and brightness of paper, detergents, and plastics. Its sulfonic acid group makes it water-soluble, facilitating its use in aqueous dyeing processes.