Lock in color intensity of dyed natural fabrics with Jacquard iDye Fixative. It increases color fastness, stops bleeding and helps prevent staining of other fabrics during laundering. It’s ideal for items that are washed frequently or have strong colors. It can be used on most 100% natural fabrics, such as cotton, linen, rayon, hemp, silk, and animal fibers. iDye Fixative can also be used with Jacquard Procion MX, Jacquard Concentrated Vinyl Sulphon, and Remazol dyes, and commercially dyed fabrics that may bleed. Not for use on synthetic fabrics. One easy-to-use 0.49 oz (14 g) packet treats up to 3 lb (1.4 kg) of fabric.