Ultramarine

a.	1.	Situated or being beyond the sea.
n.	1.	(Chem.) A blue pigment formerly obtained by powdering lapis lazuli, but now produced in large quantities by fusing together silica, alumina, soda, and sulphur, thus forming a glass, colored blue by the sodium polysulphides made in the fusion. Also used adjectively. Green ultramarine a green pigment obtained as a first product in the manufacture of ultramarine, into which it is changed by subsequent treatment. Ultramarine ash (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. - Fairholt.

Noun	1.	ultramarine - blue pigment made of powdered lapis lazuli Synonyms: ultramarine blue
	2.	ultramarine - vivid blue to purple-blue
Adj.	1.	ultramarine - of a brilliant pure blue to purplish blue color

chromatic