Answered By: Paul Chasse Last Updated: Nov 10, 2016 Views: 10
Thank you for the question! Well, considering the protective framing for the lithograph the best bet would probably be 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 frame that allows interchange between the inside and the air in the room.
It would be best located away from the direct light of windows and florescent lighting should not be used as they give off UV rays. No florescent lighting in a window free or away from window glare would be the best spot. 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 are ideal for the point of conservation--they really should not exceed 20-22 Celsius when heating in on in the winter. The optimal relative humidity would be around 55% to 65%. Clearly air conditioning and a temperature monitoring device might be of importance. Some possible devices to measure relative humidity are as follows: The sling Psychrometer, The Battery operated Psychrometer, Dial Hydrometers, and humidity indicators (You can look these up).
I am assuming that the lithograph is on 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 plexi glass and the lighting and positioning as is above.
The museum recently went through a similar process on its Blaschka collection which included some lithographs. I asked some of the directors of the operation and told them about your question and was sent the links below:
the NEDCC website.
Here is specific information on matting and framing artwork - https://www.nedcc.org/free-resources/preservation-leaflets/4.-storage-and-handling/4.10-matting-and-framing-for-art-and-artifacts-on-paper
Here is some information on temperature, light, humidity - https://www.nedcc.org/free-resources/preservation-leaflets/2.-the-environment/2.1-temperature,-relative-humidity,-light,-and-air-quality-basic-guidelines-for-preservation Here is some information on exhibition guidelines - https://www.nedcc.org/free-resources/preservation-leaflets/2.-the-environment/2.5-protecting-paper-and-book-collections-during-exhibition
Please follow the links and see if the information is useful to you. It sounds like you have a real unique and wonderful item! Thank you very much,