Widely used as a dye in the textile industry, particularly for dyeing cotton, linen, and other cellulose-based fabrics. It provides bright orange to red shades with good color fastness. Its multiple sulfonic acid groups enhance water solubility and strong binding to fibers under appropriate conditions. Commonly applied in printing inks for paper and packaging due to its strong hue and water solubility. Also utilized in biological staining for microscopy, enhancing contrast in histological samples. This dye is often used in resin fixation dyeing processes to improve wash and light fastness. Occasionally used in analytical chemistry as a pH indicator in certain test systems requiring specific pH ranges.