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Library Sciences QUESTION #1571
Question 1
Which environmental condition is considered most damaging to the long-term preservation of rare books and manuscripts?
  • Cool temperatures between 15–18°C
  • Fluctuating temperature and high relative humidity (above 65%)✔️
  • Dim, ultraviolet-filtered lighting
  • Acid-free storage boxes
Correct Answer Explanation
Fluctuating temperature and high relative humidity (above 60–65%) are the most destructive environmental conditions for rare materials — accelerating acid hydrolysis, mold growth, and insect infestation. Stable cool temperatures and controlled humidity (45–55% RH) are the recommended preservation standards.