Laundry treatment & dyeing aid. Enhances color. Increases color retention. Reduces bleeding. Works best on: cotton; linen; rayon; ramie; cellulose fibers; fabric blends (The blend must contain cellulose fibers like cotton, linen, rayon or ramie). Rit ColorStay Dye Fixative reduces bleeding while simultaneously enhancing the color of your dye project. Conforms to ASTM D-4236. ritdye.com. Made in the U.S.A. of U.S. & imported materials.