I have that the no pre-wash advice often comes from designers and shop owners who have no intention to wash a quilt. They are making them for wall quilts or show quilts and not for using them. They say that you don't have to wash the fabrics but I always prewash. I want my quilts to be loved and used not hung on the wall or displayed only. Even the good batiks have some color loss when washed....not every one but it only takes one in a quilt to fade t ruin a quilt. Choose your threads wisely as well. I have a quilt that was quillting maybe ten years ago by a professional and the thread (multi-colored) used ran in areas. I have no idea what brand was used. I hope the thread are much improved now.