from what i understand about dying, kool-aid only really works on animal fibers. it will dye other fibers, but it doesn't really "bond" to them (i sooo don't understand the science behind it). so if it gets wet, or you wash it or eat it cause it tastes good the dye will probably go away. rit dye works well on natural fibers, but not so well on synthetics. so it's success on blends depends on the amount of natural fibers. oh and please please please use gloves and please use a dust mask if you're going to use powdered dye. rit especially is very very bad for you. i wish they would have taught that when we were kids at camp dunking our hands trying to make beautiful tie-dye. please share when you're stuff's all done!