Proper handling by persons who touch the documents. Proper long-range planning for the management of their security.
Environment includes constant controlled temperature and humidity levels.
The ultraviolet portion of light does the most damage. It fades the color and acts as a catalyst to chemical reactions which break down the paper fibers. Sunlight and fluorescent light are high in ultraviolet light. Therefore, it is best to use photocopies or photographic copies for display purposes and keep the original document in the dark as much as possible. Use incandescent lamps where the document will be exposed for significant amounts of time.