Thought some would find this advice from University of Delaware professor Debra Hess Norris useful:
Q. What’s your advice for preserving these treasures?
A. In general:
- Protect these materials from high and fluctuating temperature and humidity conditions. Do not store memorabilia in attics or basements. House them in a stable, low-relative humidity environment such as an interior closet.
- Use good-quality non-acidic paper materials and boxes for additional protection. House vintage magazines and cards in polyester, polypropylene or polyethylene plastic enclosures. Do not use PVC plastics.
- Protect collection materials from high light levels that will fade organic dyes and embrittle and discolor poor-quality papers.
- Moisture ...