Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A substance that absorbs and promotes the retention of moisture from the air. The softening (plasticizing) agents in adhesives owe their effectiveness to their capacity to absorb and retain moisture. Cf:HYGROSCOPICITY . See also: FLEXIBLE GLUE ; INTERNALLY PLASTICIZED ; GLUE . (184 , 198 )

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