Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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red heat

A defect in hides and skins, appearing as red or colored patches on the flesh side of the skin, and caused by the action of halophilic bacteria, which are bacteria acclimated to living in salt solutions. The presence of "red heat" suggests putrefaction and consequent damage to the skin. The presence of halophilic bacteria in the cured skin may result from the use of marine salt, or the reuse of salt previously used in wet salting. (306 )

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