Definitions for "Scumbling"
A mode of obtaining a softened effect, in painting and drawing, by the application of a thin layer of opaque color to the surface of a painting, or part of the surface, which is too bright in color, or which requires harmonizing.
The color so laid on. Also used figuratively.
Scumbling is a painting technique in which thick, dry paint is applied to a surface in a loose, direct manner, often creating areas of broken colour and allowing previous layers to show through in places.
Keywords:  crayon, stump, drawing
In crayon drawing, the use of the stump.