I don’t pre-wash my fabric. If I’m concerned about a particular fabric, I’ll cut a strip off, soak in hot water to see if it bleeds. I make lots of queen size quilts. I use bright fabrics. I always wash the quilt before gifting in cold water with 4 color catchers. There is a little color on the catchers, but the quilts come out looking great. I’ve kept a quilt or two for myself and for the second washing, I didn’t use a color catcher, and they were fine.