Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A condition in which the grain and flesh sides of a hide or skin have received an excess of tannin in relation to the interior, or corium, of the skin. It results from the grain and flesh sides being exposed to a strong tannin liquor and becoming over-tanned while the corium has had insufficient exposure. The problem can be avoided by using weaker liquors initially, and building to stronger solutions as tanning progresses. Over tanning produces a hard, thin leather, often with a cracky, distorted (drawn) grain. See also: CASE-HARDENING . (306 )

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