Coloring Metals

Metallic objects may be colored by inimersing them in a bath íormed of 640 grains of lead acétate dissolved in 3,450 grains of water and warmed to from 38 to 90 Fahr. This mixture gives a precipitate of lead in black flakes, and when the object is plunged into the bath the precipitate deposita on it The color given dependa on the thickness of the skin, and care should be taken to treat tne object gradually, so as to get a uniform tint.' Iron treated thus acquires a bluish aspect like steel ; zinc, on the other hand, becomes brown. On using an equal quantity of sulphuric acid instead of lead acétate, and warming a little more than in the firat case, common bronze may be colored red or green with a very durable 8kin. Imitations of marble are obtained by covering bronze objecta warmed to 100 Fahr. with a solution of lead thickened with gum tragacanth, and af terward submitting them to the action of the above-mentioned precipitate of lead. Prof. and Mis. Thane Miller of Cincinnati, attended the meeting of the Y. M. C. A., in Toledo last week.