Sinai Peninsula

"Low humidity will cause parchment to dessicate and embrittle, which is particularly a concern if such objects are handled with any frequency."

Preservation Self-Assessment Program (PSAP) | Parchment
Author - Caroline Bendix, ACR, Accredited Library Conservator
ISBN 978 0 7123 5097 6
Design - The British Library Design Office
Damaged Books

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And the temperature in Sinai