Used as a pH indicator in analytical chemistry, particularly in titrations involving weak acids and bases. It exhibits a clear color change in response to pH shifts, making it suitable for detecting endpoints in aqueous solutions. Its sulfonic acid groups enhance water solubility, allowing for consistent performance in aqueous environments. Also employed in dyeing textiles due to its strong color and affinity for cellulose fibers. Shows stability under moderate temperature and light conditions, supporting use in both laboratory and industrial settings.