Rit Dye Liquid Dye in Denim will meet all your redecorating, crafting and wardrobe needs. Rit Dye works beautifully on many washable fabrics, but works best with natural fibers such as cotton, silk and linen, but still dyes wonderfully on many washable fabrics including synthetic materials like rayon, nylon and acetate. Blends will tint evenly but will not achieve full color.