DYLON Fabric Dyes are easy-to-use and completely safe for your washing machine! All-in-1 formula to revive or change the colour of your clothes and soft furnishings. This washing machine dye provides perfect, long-lasting and intense colour results. Just pull back the wrap and drop the pod into the washing machine! Suitable for: cotton, linen & viscose. Mixes with synthetics will dye to lighter shades (pure synthetics will not dye).