A few artists favored oil
paint applied with a brush as a drawing medium. While most used it for local
color, often together with gouache, Baldassare Castiglione often used a
handsome red earth oil paint as a linear medium. During the Baroque, artists
resorted more frequently to oil sketches, because they served a useful
purpose in deveoping effects of light and color without requiring much
precision in detail. Ultimately the distinction between a drawing in oil on
paper and an oil sketch on canvas became increasingly vague.
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