Used in the synthesis of dyes and pigments due to its sulfonic acid group, which enhances water solubility and binding to fibers. Commonly employed in the textile industry for producing bright, wash-fast colors. Also serves as an intermediate in pharmaceutical manufacturing, particularly in compounds requiring improved solubility. Applied in electroplating baths to stabilize solutions and improve metal deposit quality. Utilized in some water treatment processes as a complexing agent. Its dual functional groups make it valuable in polymer chemistry for modifying resin properties.