Test it for bleeding first - get a paper towel or a white rag, dampen it, then rub it on the red fabric. If the towel turns red, you're going to want to treat it before putting it in the quilt.
Here is the best, easiest way I've found to treat bleeding fabrics. It was written by a quilter who makes a lot of her own hand-dyed fabric, and this is how she removes excess dye. As far as I'm concerned, this is her ticket into heaven.
Save My Bleeding Quilt by Vicki Welsh