Due to the dry climate where the coin was discovered, the desert patina on an ancient bronze composition coin is a sandy ...

The metal has a warm golden-brown glow. But a distinct patina develops on bronze after oxidation and skin contact, which, to the uninitiated, might look dirty or muddy—a metal that’s been put ...

Hart said that patina, a chemical process, is what gives bronze different textures and colors over time. The various chemicals create different reactions on the bronze and speed up the process of ...