Electro-bronzing can be done with an alkaline coppering solution made as follows. Dissolve 2 oz. of copper sulphate in 1 quart of hot water; add this to A gal. of rain-water containing 4oz. of potassinm carbonate; then add 2 oz. of liquid ammonia, and stir until the green precipitate has been dissolved; mix this liquid with a solution of 6 oz. of potassinm cyanide in 1/2 gal. of rain-water, and filter for use. This solution is best worked at a temperature of 100"' F., but can be worked cold, with current at a pressure of from 6 to 9 volts. It deposits a bronze-coloured copper at low temperatures with the higher voltage. The bronze tint may be deepened by rinsing the coppered goods in a solution of sal-ammoniac.