Riddhi Siddhi Trading Co. Supplies Black Color Disperse Dyes. Riddhi Siddhi Trading Co. Manufactures dyes and textiles auxiliaries. Black Color Disperse Dyes are mainly used for dyeing nylon, triacetate, polyester and acrylic fibers. Black Color Disperse Dyes are prepared from the finest quality chemicals and other materials. These dyes are exclusively used for dyeing nylon, triacetate, polyester and acrylic fibers. These range of disperse dyes are available in multitude of colors and their tints such as black blue red yellow etc.