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Venetian red

A high-grade ferric-oxide pigment of a purer red hue than either light red or Indian red. Obtained either native as a variety of hematite red or more often artificially, by calcining copperas in the presence of lime. The composition ranges from 15% to 40% ferric oxide and from 60% to 80% calcium sulfate. The 40% ferric oxide is the pure grade, and sp gr, 3.45.

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