Waste Canvas is a 100% Cotton tear-away canvas that is used to do cross stitch on t-shirts, sweatshirts, etc. After the needlework is finished, dampen the threads of the canvas and carefully pull the threads out one by one. Hint - Make sure that all threads used in a washable garment are colorfast. Hand-dyes and overdyes are not suitable and regular floss should be checked for to be colorfast before stitching.
