The purpose of this process, is, as its name implies, to make the different pieces of wood of which any piece of furniture is made up, match or correspond, so that they may be of a uniform color. It will therefore be understood that some parts may require lightening, and others darkening. For the first, make a strong solution of oxalic acid in hot water, and add a few drops of spirits of nitre, and wash this carefully over the parts which are to be lightened, when quite dry, the surface should have two or three coats of white polish. Give the parts to be lightened a wash of a clear white stain, and another of white varnish, give the intermediate parts a coat of common varnish, and oil the untouched white parts, bring all up to an equal tint by a darkening stain, if necessary.