Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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1. A defect in leather appearing as a double-skin effect when the leather is bent or flexed, and resulting from the grain layer of the leather separating from the corium. It is caused by excessive staking during manufacture or by too great pressure during burnishing. Sheepskin, because of the excessive fatty tissue in the interior of the skin (especially in older animals). is particularly affected. 2. A type of crease or ribbing in paper caused by irregular tension in reeling, by moisture, or because the paper was wound too tightly after sizing. (60 , 291 , 363 )

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