Wash refers to a very thin layer of paint used generally just to stain the canvas with general tones. For oil painting, you would thin the paint using a solvent and for acrylic painting you could simply use water.
A wash will dry fast and is painted over, with some of the paint often being exposed in the finished painting. This is a great technique for establishing the general color tones in a painting without committing too much.
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Dan Scott
Draw Paint Academy