When I was in HS back in the eary 60s, I helped finish a state flowers quilt my mom and her sister had started back in the 30s. It had the outlines on the muslin blocks which were colored directly on the muslin with crayons, then ironed between two pieces of waxed paper and finally embroidered (outline stitch and some French knots). It got washed and dried reqularly til finally that 1930s muslin started splitting sometime in the late 80s early 90s. The crayoned part was still looking good.