Alcohol + Acrylic ink = Synthetic wig dye.
A bit more information can be found
http://www.cosplay.com/showthread.php?t=57484However, I might suggest testing a small part to make sure the color is what you want.
Also, India Acrylic ink works perfectly and can be found at Hobby Lobby in the art department. I tend to use 1 cup of rubbing alcohol to 8 dropper fulls of color. Also, do it outside or someplace you don't mind having the ground/area around you dyed.
