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Fine Pale Brass for Castings

Melt together 15 parts copper, 9 parts zinc, and 4 parts tin. This is rather brittle. to remain in it. The colors at first will be light to dark gold yellow, passing through all the tints of red to an iridescent brown. A similar series of colors is produced by sulphide of copper and lead, which, however, are not remarkable for their stability; whether this defect will be obviated by the use of the tin solution, experience and time alone can show. 3380. To Put a Black Finish on Brass Instruments. Make a strong solution of nitrate of silver in one dish, and of nitrate of copper in another. Mix the two together, and plunge the brass in it. Now heat the brass evenly till the required degree of dead blackness is obtained. This is the method of