I've read the same thing about the cardboard. Since they are not acid free they weren't good to wrap fabric on. When the factory manufacturers the fabric it is often wrap damp on the cardboard. This over time will make the white marks on the fabric. I have recently wrapped my fabric around coroplast (cut from a local sign shop). I took my 2-5 yard fabric cuts and wrapped on the boards. My smaller cuts are all folded the same width and color stacked. My larger pieces (5+ yrds), usually used for backing are stacked as well. Polarnotions.com has information on the cardboards and coroplast boards.