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countable and uncountable, plural sinopias or sinopie
A reddish-brown ochre-like pigment, derived from sinople, used in traditional oil painting and as the cartoon for frescos. examples
(art) The rough sketch (executed in sinopia) which underlies a fresco. quotations examples
Today many of the sinopias have been uncovered by a method called stacco.
1985, Joseph Reese Strayer, Dictionary of the Middle Ages
In the course of lifting the frescoes from the walls the restorers discovered Simone's full-scale working drawings (in red chalk made from iron oxide and known as sinopie) which lay directly beneath the painted plaster [...].
2007, Edwin Mullins, The Popes of Avignon, Blue Bridge, published 2008, page 89