gypsum
The naturally occurring hydrous form of calcium
sulfate (Ca 2 SO 4 . 2H
2 O), which is used as a filler for
printing papers, and serves to fill the spaces
between the paper fibers, thereby increasing
opacity and smoothness. It is also used in the
manufacture of GOLD
LEAF . Also called puritan filler" and "terra
alba." See also: BRIME .
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