Question: can i use idye poly on cotton?
Answer: iDye Poly contains a type of dye called disperse dye, so it works on polyester, acetate, acrylic, and nylon. It washes right out of cotton and other natural fibers, as well as rayon. There is no fixative that will make iDye Poly permanent on cotton. Commercial dye fixatives will not work on disperse dye.