Dylon fabric dyes are easy to use and completely safe for your washing machine. The all-in1 formula revives or transforms the colour of your clothes and soft furnishings, providing long lasting and intense colour. Suitable for: cotton, linen & viscose. Mixes with synthetics will dye to lighter shades (pure synthetics will not dye). One pack dyes 600g of fabric to full shade, up to 1.8kg to lighter shades. Black will always have an air of classic, chic sophistication. With Intense Black, your blacks will be at their best, rich, intense and profoundly dark.