Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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barium sulfate

A white, soluble, heavy compound (BaSO 4 ), obtained either from the natural mineral barytes, or by chemical treatment of barium with sulfuric acid, and used both as a filler and coating pigment in paper manufacture, particularly photographic papers. It is used alone or in combination with other pigments. It has good affinity for ink, a bright color, and good opacity. It does not, however, produce a high finish. It is also used to form the pigmentLITHOPONE . The artificial compound is also known as "blanc fixe." (72 )

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