Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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calcium carbonate

A salt (CaCO 3 ), occurring naturally, usually in sea deposition, and prepared commercially by passing carbon dioxide either through cold lime water, which precipitates the calcite crystalline type, or hot lime water, which gives the aragonite crystalline type. The calcite is the thermodynamically stable form. Calcium carbonate is sometimes precipitated into paper by suitable chemical reactions to deacidify the paper, and is also used both as a filler and a coating pigment in the manufacture of paper. (31 , 67 , 143 )

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