My experience with Walmarts black fabric is that it bleeds alot. Just buy a 1/2 a yard and take it home and put it in your bath room sink and add a little laundry soap and hot tap water and swish it around a little and let it set in the water. Go back and check it in 20 minutes. And you will be surprised how much it bleeds. I always wash all dark fabrics no matter what brand they are just to be on the safe side.