DYLON Natural Fabric Dye is best suited for natural fabrics such as cotton, linen, viscose, rayon, and ramie. Wool, silk, poly-cotton and poly blends will dye to a lighter shade. When dyeing polyester blends, it is only the natural fibres that absorb the dye, which is why they dye to a lighter shade. There is a rainbow of colours to choose from and an endless number of ways to use them. DYLON Natural Fabric Dye can help you to be more environmentally conscious.