document conservation and preservation
Post on 24-Feb-2016
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Causes of Deterioration• Temperature and
Relative Humidity.• Atmospheric
Pollutants.• Light.• Biological Agents.• Abuse and
Mismanagement.• Disasters.
Paper and Acid• Acidity accounts for 90
percent of paper destruction.
• Paper production.• Reasons for acidity.• Definition of acid and
acid-free.
Relative Humidity• Amount of water vapor actually
held in a specific amount of air
• low relative humidity may lead to desiccation and embrittlement of some materials
• Fluctuations can cause cockling in paper, flaking ink, warped covers on books, cracked emulsion on photographs, and cause mold growth.
• Steady RH between 45% and 60% should be the goal
• no more that 5% shift in 24 hours period
Air Quality • Are external pollutants filtered out?
• Materials the displays are made from may outgas
• Other exhibition materials may outgas• Gases form acids that attack exhibition materials and effect each media differently
Silver Mirroring
Images courtesy of: http://iaq.dk/image.htm,
http://iaq.dk/silvermirror/Gallery/Allsurface2.html
Temperature• Temperature effects
relative humidity
• Heat accelerates deterioration: the rate of most chemical reactions, is approximately doubled with each increase in temperature of 10°C
• Should remain fairly stable at or around 18-21C
• no more than 5 degree shift per month
• Lighting may raise temperature
Photographic Security and Proper Storage
• Metal Containers.• Temperature Constant:
Prints, 65 degrees. Negatives, 45 degrees.
• Humidity Constant: 45 percent.
• Gloves and Use conditions.
• Separate Negatives from Prints.
Low Cost Solutions• Implement an
environmental monitoring program
• Avoid basements and attics
• Add weather stripping around doors and windows
• Install an air conditioning unit
• Ensure proper drainage around buildings
• Install storm windows to moderate temps and reduce condensation
• Use humidifiers and dehumifiers
Conservation Videos
http://www.youtube.com/watch?v=nmC10gCi-g0
http://www.youtube.com/watch?v=JXrs8L-LUd8&NR=1
National Archives
Flattening Maps and Plans
Photographic Preservation
http://www.youtube.com/watch?v=geqVsJJK5rs
http://www.youtube.com/watch?v=fcDlbNi-9D0&feature=related
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