Use Rit DyeMore Dye on 100% polyester, polyester / cotton blends, acrylic, acetate, nylon and even some plastics. One bottle will dye one pound of dry polyester fabric. If dyeing acetate, acrylic or nylon, one bottle will dye two pounds of dry fabric. For 100 years, customers have relied on Rit to rejuvenate old garments, change the colour of their clothing and accessories, coordinate home decor, hide laundry accidents and more. Create something custom and unique with an ombre, dip-dyed, shibori or tie-dye pattern. Important: due to the complexity of dyeing synthetic fabrics, you must use this dye in a stainless steel pot on your stove top to maintain a high water temperature throughout the duration of dyeing. Cannot be used in a washing machine.