Reactive Black 5 is widely used in the textile industry as a dye for coloring cotton, linen, and other cellulosic fibers. It is particularly valued for its ability to form strong covalent bonds with the fabric, ensuring excellent wash and light fastness. This dye is commonly applied in exhaust dyeing, continuous dyeing, and printing processes, providing deep, rich black shades. Additionally, it is used in combination with other reactive dyes to achieve a wide range of colors. Its versatility and durability make it a popular choice for producing high-quality, long-lasting textiles in both industrial and artisanal settings. It is also utilized in scientific research to study dyeing processes and chemical reactions.