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
Jan van Eyck, Saint Barbara of Nicodemy, oil on panel, dead paint or underpainting that was not further finished apart from the aerial party.
Underdrawing
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Underdrawing is a preparatory drawing done on a painting ground before paint is applied, for example, an imprimatura or an underpainting. Underdrawing was used extensively by 15th-century painters lik
Underpainting
…done properly, it facilitates overpainting. If it seems that one has to fight to obscure the underpainting, it is a sign that it was not done properly. Underdrawing List of art techniques…
Anna Bilińska-Bohdanowicz, Self-portrait, 1892, National Museum in Warsaw. Unfinished portrait showing underdrawing.