Widely used in the textile industry for dyeing cotton, wool, and silk fabrics, providing a bright blue color with good wash fastness. Commonly applied in batch dyeing processes for cellulose fibers due to its high affinity and uniform shading properties. Also utilized in paper printing and as a colorant in ink formulations. Occasionally employed in biological staining for microscopy, though not a primary histological dye. Its water solubility makes it suitable for liquid dye systems and industrial applications requiring easy dispersion.