Direct Yellow 86 is a synthetic azo dye used primarily in the textile industry for direct dyeing of cotton and other cellulosic fibers like viscose and linen, providing a bright yellow shade. It offers good to moderate lightfastness and wash fastness, making it suitable for applications with limited direct sunlight exposure, such as indoor apparel and household textiles. It is also employed in wool and silk dyeing under specific conditions. Additionally, it finds use in printing inks and paper dyeing due to its high color strength and water solubility. In industrial settings, it serves as a stable yellow tracer dye for liquid flow visualization systems. Not recommended for food, cosmetics, or direct skin contact due to potential health risks.