Used as an intermediate in the synthesis of dyes and pigments, particularly for coloring textiles and paper. It plays a key role in producing acid dyes, which are known for their vibrant shades and strong affinity to fibers like wool, silk, and nylon. Additionally, it is employed in the manufacturing of organic compounds for research and industrial applications, contributing to advancements in material science and chemical engineering. Its sulfonic acid group enhances solubility in water, making it valuable in formulations requiring aqueous compatibility.