Grisaille
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Grisaille is a painting executed entirely in shades of black and grey or of another neutral greyish colour. It is particularly used in large decorative schemes in imitation of sculpture. Many grisaill
Christ and the Woman Taken in Adultery, Pieter Bruegel the Elder, 1565, 24 cm × 34 cm (9.4 in × 13.4 in)
Battesimo della gente, one of Andrea del Sarto's gray and brown grisaille frescoes in the Chiostro dello Scalzo, Florence (1511-26)
Hans Memling wing, with donor portrait in colour below grisaille Madonna imitating sculpture
Grisaille stained glass (15th century)
Underpainting
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In art, an underpainting is an initial layer of paint applied to a ground, which serves as a base for subsequent layers of paint. Underpaintings are often monochromatic and help to define color values
Grisaille
…decorative schemes in imitation of sculpture. Many grisailles include a slightly wider colour range. A grisaille may be executed for its own sake, as underpainting for an oil painting (in preparation for glazing layers of colour over it), or as a model for an engraver or other printmaker to work from. "Rubens and…
Jan van Eyck, Saint Barbara of Nicodemy, oil on panel, dead paint or underpainting that was not further finished apart from the aerial party.