It helps the quilt fibers to resist the inexorable pull and set of gravity during storage. The weight of the added items will compress the folds. Choose it for quilts comprised of cotton, linen or jute fibers. Unbuffered tissue has a pH between 6.8 and 7.2. This neutral range is best for wools or silks.
Conservators also use it for leather, fur or feathered artifacts.
When in doubt as to the fiber content of your quilt use unbuffered tissue. Acid-free tissue may be used in multiple layers as a lifting sling to remove the folded quilt from the box. This will reduce the contaminants and abrasion that human hands may contribute to very fragile antique quilts. This archivally safe material resists mold and mildew. It's smooth, white surface will shield collectibles from ambient ultraviolet light damage and dust when used as a final wrapping material for unboxed or rolled quilts.