Zinc, which is to be bronzed, should be given an electro-deposition of brass, which is then dipped into a weak solution of sulphate of copper in order to impart a red tint. When it is dry, moisten with a cloth immersed in hydro-sulphate of ammonia or proto-chloride of copper dissolved in hydro-chloric acid, or a solution of polysulphide of potassium. Dry again, then brush the surface over with a mixture of peroxide of iron and plumbago, varied in accordance with the tint desired. The powder will adhere more readily if the brush is slightly moistened with essence of turpentine. Rub the raised portions strongly to uncover the brass, then give a coat of colorless varnish. Another way is to pickle the brass or copper article with diluted nitric acid, then coat same with a paste made of 2 parts graphite, 3 parts peroxide of iron and enough spirits of wine. Brush off this coating after 24 hours, and a dark-brown bronze will appear. If a lighter bronze is desired, the brass or copper zinc should be rubbed with a soft brush dipped in a solution of 1 1/4 ounces of sal-ammoniac and 3 ounces of potassium binoxalate in 3 1/2 to 5 1/4 pints of vinegar.