Used primarily as a dye in the textile industry for coloring cotton, wool, and silk fabrics. It provides deep black shades with good color fastness. Commonly applied in dyeing processes for clothing, home textiles, and industrial fabrics. Also utilized in paper printing and occasionally in leather dyeing. Suitable for batch and continuous dyeing methods. Requires mordants for improved adhesion and durability on cellulosic fibers. Not recommended for use in food, pharmaceutical, or cosmetic applications due to toxicity concerns.