Originally Posted by quiltilicious
could you line the cardboard with tissue paper or freezer paper or something?
All wood products, including tissue paper and freezer paper, contain acid unless they have been treated to make them archival-quality (which basically removes all the acid). Archival-quality tissue paper is considerably more expensive than regular tissue paper. Freezer paper is not made in archival-quality.
Lining the boxes with fabric, such as inexpensive muslin, would probably be less expensive. Or they could probably be spray-coated with polyurethane.
I honesty don't think the acid is a problem if you are storing pieces for under a year. It's when the box gets forgotten for a few years (such as some of my UFOs!) that there is a potential issue with acid.