iDye comes in a dissolvable packet, so there are never any messy powders to handle: simply dissolve the packet in the dye bath or drop it in the washer, then add the fabric. A hot water dye that produces brilliant colors on any natural fabric, iDye may be used on the stovetop or in the washing machine on the hottest cycle. Great for over-dyeing techniques and reviving faded garments! Fabrics, Fibers & Surfaces : cotton, linen, canvas, silk, rayon and more Each packet will dye 2-3 lbs of dry fabric