Acetic acid, diluted, 4 lbs; green veriter, 2 oz.; muriate of ammonia, 1 oz.; common salt, 2 oz.; alum, ½ oz.; French berries, ½ lb.; boil them together till the berries have yielded their color, and strain. Olive bronze, for brass or copper.—Nitric acid, 1 oz.; hydrochloric acid, 2 oz.; titanium or palladium, as much as will dissolve, and add three pints of distilled water.