Ul`tra*ma*rine" (?), a. [Pref. ultra-
+ marine.] Situated or being beyond the sea.
Burke.
Ul`tra*ma*rine", n. [Cf. Sp.
ultramarino. So called because the lapis lazuli was originally
brought from beyond the sea, -- from Asia.] (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 or
ashes (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 that produced by the mixture
of more positive colors. Fairholt.