Bronzing. Bronze of a good colour acquires by oxidation a tine green tint, called patina antiqua. Corinthian brass receives in tins way a beautiful clear green colour. This appearance is imitated by an artificial process called bronzing. A solution of sal-ammoniac and salt of sorrel in vinegar is used for bronzing metals. Any number of layers may be applied, and the shade becomes deeper in proportion to the number applied. For bronzing sculptures of wood, plaster-figures, etc, a composition of yellow ochre, Prussian blue, and lampblack, dissolved in glue-water, is employed.