I have machine quilted several of the vintage emb. tops for different people. Before quilting, I explained that the blue marks probably would not come out. The response from each person was they would rather have it quilted and able to display or use it with the blue marks still there than have it sitting unfinished in a drawer or closet. Personally, I thought the blue marks almost disappeared once the quilting was done. And the owners of the quilts were very pleased with the outcome.