MARK MAKING
Refers to the application of marks that vary in their weight, value, texture, length and direction. Their density determines the resulting value.
HATCHING
The use of lines or strokes of varying lengths that are group together to form value.
PARALLEL HATCHING
The use of lines or strokes which are uniformly aligned, parallel to each other without regard for the planar structure
CONTOUR HATCHING
The use of lines or strokes which follow the curvature or planar directions of the object. The strokes may curve on a curved plan or may be straight as the follow a flat plane.
CROSS-HATCHING
The use of parallel hatching lines which change angles or direction as they are overlaid, rapidly building value range. The directional change can be minimal or as much as 90 degrees
STIPPLING/POINTILISM
Often reserved for pen and ink or markers, stippling refers to the application of dots of value laid down one at a time. The density of dots determines the resulting value.
SCRIBBLING
Use of free form, but controlled scribble lines to create value. The density of the scribble lines determines the resulting value.