â€œnishikiitoâ€? is the cosmo brand metallic thread for hand embroidery. This thread is crafted with the same technique to produce gold thread used in traditional Japanese clothing in the former capital of Japan, Kyoto. Precautions for Use Do not use this thread with sewing machines. Do not iron. Wash with pH neutral detergent when sweat or dirt attached to this thread. Do not use alkaline detergent (col.1, 5-17, 24-33, 101-112 and 301-306). Store this thread in a cool place away from heat and humidity. This thread might turn black in contact with leather or rubber (Col. 2-4, 18-23 and 201-206). Color of this thread might look different when exposed to ultraviolet rays (Col. 201-206).