I just finished a 92x108 quilt for my DH. Sprayed off the markings with water. As usual I put it in the washer with cold water to soak any marks that did not come out, along w/color catchers. Well, there was so much blue overdye on the backing that it bled thru to the beige on the front of the quilt. Needless to say, I will from now on prewash ALL fabric before I make another quilt. I have never ever had this happen before. Guess I have learned a lesson the hard way. The front now has a really dull greyish blue look.