when working with dark, questionable fabrics (especially red) you really should wash it and wash it until it doesn't bleed any more...sometimes ...cheap fabrics mainly...it will never stop, but you can try to set the color with a commercial product or vinegar; soda; salt; (not all together :) .... always test a small piece and and see how much washing it is going to take to get it to stop; maybe save that fabric for a 'red' quilt, or one dark that the bleeding won't matter. another one of those moments where you really do get what you pay for...quality fabrics don't bleed like the inexpensive fabrics tend to. sorry and good luck