DYLON Pre-Dye helps remove or reduce existing colour so new dye shades can take more evenly on washable fabric. This 200 g pack is used as a preparation step when changing from a strong colour, refreshing faded items, or aiming for a lighter base before dyeing. Results depend on fibre content and previous dyes, so follow the directions closely and test a small piece whenever possible Check fibre content and wash instructions before dyeing or washing.