Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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French chalk

Soft, finely powdered magnesium silicate (MgH 2 (SiO 3 ) 4 ), which is dusted between the leaves of a book prior to gilding the edges so as to prevent the leaves from sticking during the gilding process, and also to remove grease stains from paper. (154 )

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