Dylon hand dye sachets are the ideal way to refresh faded colours or add new life into smaller items like shorts, vests or socks, and for delicates, you'd rather not put in the washing machine like wool and silk. Suitable for: wool, silk, cotton, linen & viscose. Mixed fabrics will achieve a lighter colour and synthetic fabrics like polyester and nylon won't dye. One pack dyes 250g of fabric to full shade and up to 500g to a lighter shade. Use multiple packs to dye larger quantities.