I have used those for about a year now to wash my quilts and make sure they do not bleed into each other. It works great. I go to a commercial washer and use the triple load so they have lots of water, and I use Ivory liquid soap and cold water. First time I put 4-5 sheets in with the quilt and after that I have used only 2 sheets and so far so good. I am doing a purple batik quilt now for a grandson and I will do the same thing with it. I just know that one is going to bleed like crazy. Will also send a box to these sheets with the quilt and will add washing instructions to the back of the quilt. Better be cautious with it than take a chance. Jan