DMC Stranded Cotton Threads
This what the manufacturer says about their threads.
Care and Washing: Colours are washable and fade resistant. Please take into account the fabric onto which you have embroidered. We recommend washing with a mild soap. After washing, wrap your embroidery in a towel to remove excess water, then dry flat. Place your embroidery on a clean cloth, preferably while still damp, and iron on the reverse side, at the temperature setting recommended for the fabric.”