Scheele's Green is a compound oxide of copper and arsenic, or arsenite of copper, named after the justly celebrated chemist who discovered it. It is variously of a beautiful, light, warm, green colour, opaque, permanent in itself and in tint with white lead, but must be used cautiously with Naples yellow, by which it is soon destroyed. Schweinfurt green and Vienna green are also names of a fine preparation of the same kind as the above. These pigments are less affected by damp and impure air than the simple copper greens, and are, therefore, in these respects rather more eligible colours than copper greens in general.