Common drawing tools are pencils, charcoal, crayons, pastels, and pen and ink. Many drawing materials are not water or oil based and are applied dry, without any preparation. Water-based drawing media (e.g., "watercolor pencils") exist, which can be drawn with like ordinary pencils, then moistened with a wet brush to get various effects. There are also oil-based pastels and wax-based crayons. Very rarely, artists have drawn with (usually decoded) invisible ink.
One thing that differentiates drawing from painting is that in drawing, an artist uses pure colors and cannot mix them before application. (In painting, new colors are commonly created by mixing.)
The colors of drawing media can mix on the surface because of direct chemical interaction. More usually, the mixing is optical rather than chemical: colors are overlaid (also known as glazing) on previous layers so that light reflected from below the surface comes through, or color strokes are close enough that the eye "mixes" them.
Some artists have started referring to pastel and colored-pencil compositions as "paintings".
See also: engineering drawing
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