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To Bronze Iron Castings

Greenish Grey and Violet Tint. An cleaning (see No. 3641) and subsequent imorange tint, inclining to gold, is produced by mersion in a solution of sulphate of copper, first polishing the brass, and then plunging it when they acquire a coat of the latter metal. for a few seconds into a neutral solution of They must be then washed in water. crystallized acetate of copper, care being 3792. Surface Bronzing. This term is taken that the solution is completely destitute applied to the process of imparting to the of all free acid, and possesses a warm temper- surfaces of figures of wood, plaster of Paris, ature. Dipped into a bath of copper, the &c., a metallic appearance. This is done by resulting tint is a greyish green, while a beau- first giving them a coat of oil or size varnish, tiful violet is obtained by immersing it for a and when this is nearly dry, applying with a single instant in a solution of chloride of andabber of cotton or a camel-hair pencil, any timony, and rubbing it with a stick covered of the metallic bronze powders; or the powwith cotton. The temperature of the brass at the time the operation is in progress has a great influence upon the beauty and delicacy of the tint; in the last instance it should be heated to a degree so as just to be tolerable to the touch.