from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Either of two basic carbonates of copper, used as a blue or green pigment.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. verdigris
- n. Either of two pigments (blue verditer and green verditer) made by treating copper nitrate with calcium carbonate.
from the GNU version of the Collaborative International Dictionary of English
- n. Verdigris.
- n. Either one of two pigments (called blue verditer, and green verditer) which are made by treating copper nitrate with calcium carbonate (in the form of lime, whiting, chalk, etc.) They consist of hydrated copper carbonates analogous to the minerals azurite and malachite.
from The Century Dictionary and Cyclopedia
- n. A name applied to two pigments, one green, the other blue, prepared by decomposing copper nitrate with chalk or quicklime. See greenand blue.
_Green Bice_, or Green Verditer, is the same in substance as blue verditer, which is converted into green verditer by boiling.
The plumage of this flycatcher is pale blue -- blue of that peculiar shade known as verditer blue.
_ -- The ancient blues were very numerous; the principal of these was cœruleum, azure, a species of verditer, or blue carbonate of copper, of which there were many varieties.
_ -- Chrysocolla, which appears to have been green carbonate of copper, or malachite (green verditer), was the green most approved of by the ancients; there was also an artificial kind which was made from clay impregnated with sulphate of copper (blue vitriol) rendered green by a yellow dye.
Another method is by first painting the article, after it has been rendered nonabsorbent, of a dark color made of Prussian blue, yellow ochre, and verditer, ground in oil.
Authorities state that these may be formed from bright Prussian blue or verditer glazed over with Prussian blue or of smalt.
Prussian blue possibly a genuine Prussian blue toned down to a sky blue with white lead is meant, and by verditer the variety known as refiners 'blue verditer, and as to smalt it must not be forgotten that it changes its colour in artificial light.
It is prepared from malachite, a beautiful copper ore employed by jewellers, and is a hydrated dicarbonate of copper, combined with a white earth, and often striated with veins of mountain blue, to which it bears the same relation that green verditer bears to blue verditer.
Neither is durable, especially in oil; and, as pigments, both are precisely of the character of verditer.
The first is a blue mineral found near copper mines, while the last is simply a verditer.