if it is batiks I would dip a corner in water or cut a section in water and test for bleeding. otherwise I wouldn't worry about it. but that is just me. I only wash fabric that is a suspected bleeder. Those are mostly batiks. I always dip a corner in water to check it for bleeding. had some fabric that I didn't think would bleed and I started to starch it and it stained my ironing board. so I immediately tossed it in some cool water a couple of times to get it to bleed out. It worked. sometimes the dies don't wash out completely.