Applying the Patina
The final stage of the process involves applying the patina or coloration to the surface of the bronze. Since bronze alloys consist mainly of copper, sculptors usually apply chemicals to the surface of the bronze to cause a controlled chemical reaction that produces beautiful colors that will prevent corrosion if the bronzes are kept inside. Outdoor patinas need to be washed and waxed each year and eventually will need to be redone.
Step #16