After years of not pre - washing and never having a problem, I decided to pre - wash because I'm making a quilted jacket and want it to fit when done. It was fortunate, as I had my first colour run on some French braids that I want to put in panels on the jacket, I amusing black, white and red - of course the red ran and the white bits have a pink tinge. The colour catches don't seem to have an effect. My main course of action is trying to figure out which one of the reds was the culprit.lol - Won't be using that one again! Hope you've had success with fixing your quilt.