No heat, it shouldn't shrink!
check the fabric for bleeding,
fill a glass with hot water, put a piece of questionable fabric in the water, add a drop of detergant, let it soak for several minutes. Pull the fabric out and rub it with a piece of white scrap fabric. if it bleeds then I would wash it in cold water and air dry it. RECHECK IT!!!! If it still bleeds after the wash you can try using Retayne in the next wash!