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1 definition found
for Ultramarine ash
From The Collaborative International Dictionary of English v.0.48 :
Ultramarine \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 Ultramarine 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 than that
produced by the mixture of more positive colors.
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