Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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attapulgite clay

A fibrous claylike material, essentially ((OH 2 ) 4 Mg 5 Si 8 O 20 (OH) 2 -- 4H 2 O), rich in magnesium, and used as a filling material in papermaking, usually in coatings for reproduction papers. The clay is also called "fuller's earth," from its ability to remove dirt and grease from wool, a process called "fulling." (17 )

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