Jacquard iDye Fabric Dye-Violet (For Polyester)" /> Dyeing fabric in a washing machine has never been easier. iDye Poly comes in a packet that dissolves in water, so you don?t have to handle messy dye powders. For top loading washing machines, just throw the dye packet in, add salt and run through the wash cycle. iDye Poly offers the ultimate way to get gorgeous color! For use on polyester, nylon and synthetic fabrics, Each pack will dye 2-3 pounds of fabric