Scumbling, often called the 'brillo pad' technique, uses layers of small calligraphic, scribbled marks to build up value and texture. Varying the direction and shape adds more interest than a simple circular scribble.
Random hatching uses layers of short, straight marks. Various textures result depending on whether these short hatches are applied vertically, at right angles, following a contour or at random angles.Scumbling usually refers to the application of a fine layer of paint with a very dry brush. It is sometimes described as a glaze effect, but rather than the pigments being dispersed in a transparent medium, scumbling creates a fine mesh of opaque pigment. it is sometimes used to describe a random, scribbled texture, with figure-eight and concave shapes used to create a spiky texture, rather than the common circular scribble. Scumbling effects can be created by using fine pencil lightly applied in a random fashion. The softening or blending effect of dry scumbled paint can be mimicked by using layers of light, random erasing combined with random hatching. Shading with the side of a pencil or broken pastel can create a similar, open texture.
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