Photographs are multilayer constructions of different materials, organic and inorganic, and their preservation is more complicated than that of plain paper. Accelerated aging tests, showing their reactions to long exposure to heat, dryness and humidity and the damaging effect of light, indicate that paper storage envelopes for negatives are impermanent and often damaging to the image. Wood, particle board or pressboard can produce fumes that will attack photographic films. Closed containers of anodized aluminum or stainless steel are preferable. Daylight should be excluded from storage areas and fluorescent lights should be shielded with ultraviolet filters such as VF3 Plexiglas. Other details about frames, mounting boards and adhesives are given.