Impasto — Art, 14–17
Impasto is paint applied thickly enough to keep visible ridges, peaks or brush marks. The surface becomes part of the image, so light catches the paint as well as the colour.
Paint with a physical surface
Most paint spreads into a fairly flat layer, but impasto leaves the paint standing above the canvas. A stroke can look like a ridge, a dab like a small peak, and the painting changes as your viewpoint or the light changes.
Why artists built up paint
Artists used thick paint when a flat image was not enough to suggest energy, material or the act of painting itself. In the nineteenth century, many painters made brushwork visible instead of hiding it, so the surface could carry emotion as well as representation.
Building an impasto highlight
Paint a dark blue sphere with a thin layer first. Mix white into a small amount of blue, load only one side of a stiff brush, and press it near the imagined light; leave the raised mark visible, because its edge and height help the sphere feel round.
The thick-paint trap
A reasonable mistake is to pile paint everywhere and call the result impasto. Thickness alone is not the idea: a heavy surface can become muddy, crack, or hide the structure, while purposeful thickness places texture where it strengthens light, material or movement.
Where it is useful
Impasto appears in expressive paintings, palette-knife work, murals and some three-dimensional illustration. It is useful when you want a surface to catch light, show a quick gesture, or make a painted object feel materially different from the wall behind it.
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