I just did this. Bought a cheap plastic bowl used black rit dye, brought water to a boil mixed dye then took a meat thermometer and set it in the dye until the temp came down to just under 150* then dipped parts in for about 1.5 to 2 minutes. Turned out great. Be careful not to grab the parts with your fingers until dry as the prints will show up. Also clean thoroughly with soap and water and denatured alcohol prior to dyeing. Randy