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Normal wear and patina. Theseitemshave not been cleaned or polished.
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Patinas are films that develop on the surface of a metal, wood, or other substance over a period of time. In many instances, the development of a patina is considered desirable and may actually enhance the value of the item.
One of the more desirable forms of patina have to do with the gradual development of a brown or green film on metal objects. Due to exposure to open air and the natural process of oxidation, an aged metal such as copper and bronze tend to develop a patina that is often a pleasing shade of green. Domes and roofs on buildings that feature sections of copper tend to develop this green shade over a number of years. The patina is often anticipated in the original design of the structure and is an effect that the owners look forward to taking place over time.
A patina also often develops with various pieces of jewelry over time. In the case of jewelry that has reached an age where the pieces are considered antique, the presence of a patina is thought to enhance the overall appearance and value of the jewelry. When this is the case, cleaning the jewelry to remove the patina is not considered desirable, as the action will actually decrease the value of the piece.