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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