Insert freezer paper between the covers and the text blocks of each book to prevent the covers from staining the pages.
After separating pages, place freezer paper between pages with bleeding ink or colorants. Do not use absorbent interleaving. Do not over-stress the bindings with excess freezer paper or insert freezer paper deep into the gutter.
If a book requires large amounts of interleaving, then it must be fully dried in a fanned position with covers supported by blocks.
Small books with rigid covers can be stood upright and fanned open. Invert books every 8-12 hours to prevent damage to the covers or sewing and to promote even drying.
Oversize books or items with weak covers should be placed flat and opened as far as possible without breaking the spine.
Support covers with blocks at a partial opening if the item cannot lay flat.