GREEN PAIN TS. Green, which is so common a color in the vegetable kingdom, is very rare in the mineral. There is only one metal, copper, which affords in its combinations the various shades of green in general use. The other metals capable of producing this color are, chromium in its protoxyde, nickel in its hydrated ox yde, as well as its salts, the selcniate, ar seniate, and sulphate ; and titanium in its prussiate.
Green pigments are prepared also by the mixture of yellows and blues ; as, for example, the green of Rinman and of Gellert, obtained by the mixture of cobalt blue, and fiewers of zinc ; that of Barth, made with yellow lake, Prussian blue, and clay ; but these paints seldom appear in the market, because the greens are ge nerally extemporaneous preparations of the artists.
Mountain green consists of the hydrate, oxyde, or carbonate of copper, either fac titious, or as found in nature.
Bremen or Brunmick green is a mixture of carbonate of copper with chalk or lime, and sometimes a little magnesia or am monia. It is improved by an admixture
of white lead. It may be prepared by adding ammonia to a mixed solution of sulphate of copper and alum.
Frise green is prepared with sulphate of copper and sal ammoniac.
Millis green is an urseniate of copper ; made by mixing a solution of acetate or sulphate of copper with arsenite of potas h. It is in fact Scheel's green.
Sap green is the inspissated juice of buckthorn berries. These are allowed to ferment for 8 days in a tub, then put in a press, adding a `little alum to the juice, and concentrated by gentle evaporation. It is lastly put up in pigs' bladders, where it becomes dry and hard.
Schweinfurt green ; see SCHWEINFITRT.
Verona green is merely a variety of the mineral called green earth.