Value
The lightness or darkness in a color
Gradation
A shading technique in which there is a gradual change in value from light to dark
Blending
A shading technique that shows value without seeing lines
Hatching
A shading technique that shows value by drawing closely spaced parallel lines
Crosshatching
A shading technique that shows value by drawing layers of parallel lines that go in various directions
Stippling
A shading technique that shows value by adding a lot of tiny dots to form an image
Pointillism
A shading technique that shows value by adding a lot of multi-colored dots to simulate blended colors.