Reactive Black 5 is widely used in the textile industry for dyeing cotton, linen, and other cellulosic fibers. It is particularly valued for its ability to form strong covalent bonds with the fabric, ensuring excellent color fastness and durability. This dye is also employed in the printing of textiles, providing vibrant and long-lasting colors. Additionally, it is used in research and development for studying dyeing processes and improving dye efficiency. Its application extends to the production of colored paper and leather, where it imparts deep, consistent shades.