This DYLON Hand Dye sachet is designed for small-batch recolouring when you want a lasting shade change for clothing or home textiles. In the Navy Blue shade, the packet is mixed in warm water for hand dyeing and is intended for many natural-fibre fabrics, with lighter results on blends. For the most even finish, start with clean fabric, use the recommended salt amount, and test a small swatch if the item is already coloured.