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Related to Ultramarine ash: Ultramarines
|(Paint.)||a pigment which is the residuum of lapis lazuli after the ultramarine has been extracted. It was used by the old masters as a middle or neutral tint for flesh, skies, and draperies, being of a purer and tenderer gray than that produced by the mixture of more positive colors.|
See also: Ultramarine
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.