Hi. I just picked out my fabric for the back of my jelly roll race quilt. It is a dark purple. I don't typically pre wash my fabric but the lady at the store said I should DEFINATELY pre wash this. Will this make the quilt look funny if the the backing is the only thing that is pre washed....but the lady also said purple is one of the worst colors for bleeding,,,,but that has me panicked as there is a lot of purple in the jelly roll and I can't obviously pre wash that..
Thanks

