eColourant is a ready-to-use printing paste and spray for removing areas of colour from dyed natural fabrics such as cotton, linen, silk and wool. Unlike bleach, deColourant removes colour without jeopardizing the integrity of the fiber. How does it work? deColourant is activated by heat. If you don’t like what you’ve done, just wash it out! Nothing happens until you heat the deColourant print.