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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