For use in automatic front loading machines only. Suitable fabrics: cotton, linen, viscose and polyester/cotton mixes. Lighter shades on polyester mixes because pure synthetics do not pick up the dye. One pack will dye up to 600g /1lb dry weight fabric. Dyeing larger amounts (up to 1200g) will give a lighter colour. You will need: 500g / 1lb of salt (regardless of the number of packs used) and a pair of rubber gloves.