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Bronzing with Crocus

Make little sulphuretted alkali (sulphuret of ama thin paste of crocus and water lay this monia is best). The face of the medal is paste on the face of the medal, which must washed over with the solution, which should then be put into an oven, or laid on an iron be dilute, and the medal dried at a gentle plate over a slow fire when the paste is per- heat, and afterwards polished with a hard fectly reduced to powder, brush it off and lay hair brush. Sulphuretted hydrogen gas is on another coating; at the same time quicken sometimes employed to give this black bronze, the fire, taking care that the additional heat but the effect of it is not SO good, and the gas it is not so good, and the gas is uniform; as soon as the second application is very deleterious when breathed. In these of paste is thoroughly dried, brush it off. bronzes the surface of the copper is converted The medal being now effectually secured into a sulphuret . from grease, which often occasions failures in 3779. German Method of Bronzing bronzing, coat it a third time, but add to the Brass Black. There are two methods of strength of the fire, and sustain the heat for procuring a black lacquer upon the surface of a considerable time; a little experience will brass. The one which is that usually emone which is that usually emsoon enable the operator to decide when the ployed for optical and scientific instruments, medal may be withdrawn; the third coating consists in first polishing the object with being removed, the surface will present a Tripoli, then washing it with a mixture comwashing it with a mixture combeautiful brown bronze. If the bronze is posed of 1 part nitrate of tin and 2 parts deemed too light the process can be repeated. chloride of gold, and, after allowing this wash