Direct Black Dye is a group of synthetic dyes that belong to the class of direct dyes, commonly used for dyeing cotton, rayon, and other cellulosic fibers. It is a water-soluble dye that can be directly applied to the fiber without the need for a mordant or fixative. They are known for their high color intensity and good lightfastness, as they are resistant to fading when exposed to light. These dyes are often used in the textile industry for dyeing garments, fabrics, and other textile materials. Direct Black Dye is known for their high color intensity and good lightfastness, which are resistant to fading when exposed to light. These dyes are often used in the textile industry for dyeing garments, fabrics, and other textile materials.