Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The process of tanning hides and skins in layer vats over a long period of time in order to assure a full tannage. The hides or skins are dusted with finely ground raw vegetable tanning materials to provide additional tanning material. Laying-away, which was practiced in situations where only weak tan liquors were available, has been little used since the introduction of concentrated tan liquors. (363 )

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