Patina refers to the thin layer that forms on the surface of materials, particularly metals, due to oxidation or chemical reactions over time. This process can create a distinctive color and texture, often seen in items like bronze sculptures or copper roofs. The greenish hue on the Statue of Liberty is a well-known example of patina. In addition to metals, patina can also develop on wood and leather, giving these materials a unique character and charm. Many people appreciate patina for its aesthetic appeal, as it signifies age and history, enhancing the beauty of objects like antique furniture or vintage leather bags.