Color Grabber - a product available in the detergent aisle that 'grabs' excess dye from fabric in the washer. They're about 1/2 the size of a 'Bounce' sheet. I use one in the washer when I prewash new fabric. I wash dark fabrics 1 at a time. Light fabrics, I fill up the tub. They don't seem to run excess dye. If the dye doesn't run, I re-use the sheet with another fabric.