in Painting, is when a design, drawn with a pen or crayon, has some one colour laid over it with a pencil, as Indian ink, bistre, or the like, to make it appear the more natural, by adding the shadow of prominences, apertures, &c. and by imitating the particular matters whereof the thing is supposed to consist.

Thus a pale red is employed to imitate brick and tile; a pale Indian blue, to imitate water and slate; green, for trees and meadows; saffron or French berries, for gold or brafs; and several colours for marbles.

WASHING of Ores, the separation of the ores of metals, by means of water, from earths and stones, which would otherwise render it difficult of fusion. See ORES, Reduction of.