Relative humidity and temperature Store paper materials in dark, cool, relatively dry locations. Avoid light, heat and dampness. Maintaining steady temperature and relative humidity is preferable over conditions that cycle up and down. Attics, bathrooms and basements are generally to be avoided. Inside walls are drier than outside walls, where moisture can collect.
Vigilance is necessary to ensure maintenance of acceptable environmental conditions.
UV radiation, which is emitted by the sun and fluorescent bulbs, is particularly damaging to paper items. If UV is present, it should be eliminated by using a filtering glazing in frames, or filters over windows and bulbs. The intensity and length of exposure to visible light on paper items should be reduced as much as possible. Close drapes and hang pictures on inside walls away from sunlight and long term lighting. In some cases framing a photocopy or photograph of an original item will be a good substitute for exposing the sensitive original to light damage.