Some Black fabrics are worse than others.... I would never put cotton/Polly blend in any of my quilts. It dose not stitch the same and if you didnt pre shrink the fabrics the cottons will shrink but the blend will not... get a small pices of different blacks and wash with something that sheds and se which one dosen't pick up the most and then re wash and see how it works before putting into your quilt... I havent ever had a problem with it and I use a lot of black. good luck