Last Updated: Aug 04, 2017     Views: 46

Well, considering the protective framing for the lithograph the best bet would probably be a UV protective Plexiglas such as the slightly yellow UF-3 or Plexiglas G to filter out ultraviolet rays. The frame should be dust free, acid-free and form a closed, but not airtight, that allows interchange between the inside and the air in the room. 

The best location for display would be away from the direct light of windows or any glares from the window, as well as away fluorescent lighting, to protect the piece from UV rays. Light filters such as blinds and shaded should also be considered as well as UV monitoring. In general, materials age gradually through exposure to oxygen humidity, light and other factors in the environment.

Temperatures between 12 and 18 Celsius (53.6 and 64.4 Fahrenheit) are ideal for the point of conservation--they really should not exceed 20-22 Celsius (68-71.6 Fahrenheit) when heating is on in the winter.  The optimal relative humidity would be around  55% to 65%. Air conditioning and a temperature monitoring device might be of importance for ensuring proper temperature control.  Some possible devices to measure relative humidity are as follows: the Sling Psychrometer, a Battery-Operated Psychrometer, Dial Hydrometers, and humidity indicators. Talas, a website selling bookbinding, archival, and conservation supplies, has many tools for monitoring humidity and preserving artwork for sale online. 

I am assuming that the lithograph is on the paper format from the description as a multi-sheet. Materials vary in their sensitivity to light; most metals, pottery, and precious stones are insensitive to light, although colored glazed applied to them will change with exposure to light. Paper is very sensitive to light which is why I recommend the UV protective plexiglass, the lighting, and the positioning as described above.

The museum recently went through a similar process on its Blaschka Collection, which included some lithographs. Our website has some general preservation tips that might be helpful. I asked some of the directors of the operation, and the Northeast Document Conservation Center (NEDCC) was recommended.  You can find specific information on matting and framing, temperature, light, & humidity, and exhibition guidelines