Shout puts out a color catcher (and I think there are other brands.) It seems to be a type of toweling and If you put it in a washing machine with mixed colors that bleed, the cloth is supposed to catch the dye and trap itl I don't want to sound like a testimonial, but I have found it does catch quite a bit of the dye bleeding from bright colored fabrics. I really try to wash all my fabrics before using them. But sometimes, that is difficult, especially with charm packs and the like. I have several friends who have had quilts ruined because of dyes running. A couple involved batiks and a couple of others had reds bleed.