demitint

from The Century Dictionary.

• noun In painting, a gradation of color between positive light and positive shade. Commonly called half-tint.

from the GNU version of the Collaborative International Dictionary of English.

• noun That part of a painting, engraving, or the like, which is neither in full darkness nor full light.
• noun The shade itself; neither the darkest nor the lightest in a composition. Also called half tint.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun art That part of a painting, engraving, etc. which is neither in full darkness nor full light.
• noun art The shade itself; neither the darkest nor the lightest in a composition.