Oops! Need a little help here. I marked a heart pattern (with permanent marker) on glad press and seal and then sewed over it. It turned my white thread black. Ripped out the stitches and there is still black on my quilt. Is there any hope of getting this out? The only thing I can think of is to stitch over it in purple. My quilting really isn't good enough to have my stitches show that much - as you can tell in the pic.