Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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talc

A hydrous mineral consisting of magnesium-silicate (3MgO . 4SiO 2 . H 2 O)., Commercial talc is seldom if ever a pure mineral and therefore its physical and chemical properties usually vary over a relatively wide range. A commercial talc, such as soapstone, when ground into a very fine powder generally has a soft and greasy feel and is usually creamy to greenish-white in color. Talc is used as a filler in cultural papers, to which it imparts a raglike feel. (17 )




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