If I think a fabric will bleed I go in the restroom of the shop/store and wet a paper towel with hot water. I take to the fabric and on the very end by the selvage I rub a tiny spot. If any color gets on the wet paper towel I don't buy it. I have saved myself lots of frustration, even if I love the fabric, I find something else. Some shop owners don't mind at all to try the test others say NO the fabric is quilt shop quality and won't bleed. Yeah right.