The Black 236 acid dye is supplied by us that is used to color silk, wool, feathers, other protein fibers and nylons, and nothing does it better. As with commercial dyes, people will need to take extra care when washing the finished project to keep black clothes black. The black dye has a wide variety of applications and is easy to use. People dye bones, leather, plant fibers, shells, seeds, or feathers. The offered Black 236 is very useful and easy to use.