Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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air dry

A condition usually associated with paper (and paper pulp) and leather. Paper is said to be air dry when its moisture content (usually 3 to 9%) is in equilibrium with the atmospheric conditions to which it is exposed. Leather is considered to be air dry when its moisture content is approximately 14% of the weight of the leather. Their different moisture contents in the air dry state makes it difficult to regulate the conditions of storage of a leather bound book. (17 , 363 )

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