I haven't used the muslin but did have some printed pieces I bought at a quilt shop 10-11 years ago. Made table runner & placemats with it, they turned out great & I didn't experience any shrinkage. I am pretty sure I've used some of the scraps in a few quilts too. If you are concerned why not cut a piece and wash/ dry it? I have washed ( regular cycles, warm water, regular dryer settings) my placemats many times over the years.