Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A cover marble executed by first painting the covers with a brown coloring and then water, followed by splashes of copperas (ferrous sulfate). A solution of alum is then thrown on, followed by a bold sprinkle of dilute sulfuric acid. An alternative "wainscot" consists of brown, a coating of glair, black in large spots, brown again, this time in large spots, and finally the dilute sulfuric acid. (95 , 97 , 152 )

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