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Some objects contain materials that will deform and weaken, or even melt, above a certain temperature. [8] Inappropriate relative humidity effects a wide range of object materials and storage solutions. Relative humidity is the quality of the air that ranges between damp and dry, which causes damage to objects. Damp is when the relative ...
For the long-term preservation of organic material like parchment, the ideal temperature range is 10–15 °C (50–59 °F) with a relative humidity level of 30–50%. The ideal storage and display environment is oxygen-free, as oxygen prevalence has been shown to react with collagen over time, leading to increased brittleness of parchment.
Temperatures should range between +/- 5% of 70 °F and the humidity between +/- 5% of 50% Relative Humidity. A Relative Humidity over 65% can lead to mold growth and dry rot. [5] Panel paintings are subjected to various environmental conditions during exhibition. Regulating temperature, relative humidity, light intensity and duration of ...
Rapid fluctuations in relative humidity can also be damaging, as "Rapidly fluctuating temperature and relative humidity compound all of these effects." [15] Institutions should aim to keep the RH constant in exhibitions and storage areas because many organic objects expand and contract as both temperature and RH change. [16]
Key environmental factors to watch include temperature, relative humidity, pests, pollutants, and light exposure. In general, the lower the temperature is, the better it is for the collection. However, since books and other materials are often housed in areas with people, a compromise must be struck to accommodate human comfort.
Relative humidity (RH) and temperature are two of the most common threats to photographic plates. [10] As with all material collections, high temperature in combination with high humidity can cause mold growth and attract pests. Photographic plates face significant structural and chemical challenges unique to their makeup.
The relative humidity ideally is between 45–55% and the temperature at 70 °F (21 °C). If the relative humidity is too low it can lead to desiccation, shrinkage, and cracking. When the relative humidity it too high is can cause warping and swelling of the ivory. [8] If the relative humidity exceeds 60% for a sustained time there is a chance ...
Relative humidity is kept at a level between 30 percent (in the winter) and 55 percent (in the summer) with fluctuations of no more than 15 percent during each season. [17] Mold can infest these organic objects when the relative humidity in storage and display areas exceeds 60 percent for extended periods of time. White or greenish fuzzy growth ...