Attics are awful locations for the storage of valuable material. Humidity fluctuations combined with temperature fluctuations can weaken paper. An additional result may be the growth of mold which stains, softens and crumbles paper. Basement corners can have high levels of humidity and should be avoided as storage sites. The most effective way to maintain a constant environment is through air conditioning.
Air conditioning can be the most important factor in the preservation of collections.
Paper is adversely affected by both natural and artificial light. Ultraviolet rays emitted by sunlight or fluorescent lights can damage material and cause light sensitive items such as photographs and blueprints to fade. Keep archival material away from windows or at least have windows shaded. Use caution in displaying original material for extended periods of time under fluorescent lights. Incandescent bulbs can also be harmful due to the heat emitted from these lights.