Patina is a layer of oxidation that forms on metal surfaces over time, giving them a distinctive, aged appearance. It can be both a natural and a chemically induced process, and it is often sought after for its aesthetic qualities. Patina can add depth, character, and a sense of history to metal surfaces, making it a popular choice in design and architecture.Patina is a layer of oxidation that forms on metal surfaces over time, giving them a distinctive, aged appearance. It can be both a natural and a chemically induced process, and it is often sought after for its aesthetic qualities. Patina can add depth, character, and a sense of history to metal surfaces, making it a popular choice in design and architecture.