Wow! I just noticed the backing on the antique quilt is red. You might want to dampen a piece of white fabric and rub it gently on that red backing to see if any dye transfers. If it does transfer, you want to be sure to use a *lot* of water and Synthrapol when you wash it so that any loose dye particles are sufficiently diluted in the water (and Synthrapol keeps those dye particles suspended so they are less likely to settle in other fabrics). Also be prepared to do several washes and rinses until the water is clear.