Value refers not only to the use of [[Value (colorimetry)|lightness]] and darkness in a piece of artwork,but also in the Black and White spectrum (Black to white) the middle of the 2 extremes is called middle grey.<ref>{{cite web|title=What is Value in Art? |url=http://arthistory.about.com/cs/glossaries/g/v_value.htm}}</ref> Adding white to lighten the color is called Tint while addition of black is called Shade.