RIT ProLine Colour Remover Powder helps remove or reduce existing dye to create a clean, even base before re-dyeing. This non-chlorine, reductive bleach works on most washable cotton, linen, rayon, silk and nylon, and may lighten some polyester depending on how it was dyed. For best results use the stovetop method at a constant simmer; it won’t remove prints/patterns or the indigo dye from denim. Follow garment care instructions after dyeing for best results.