Copper is Durable

Indoors, copper and its alloys will very slowly darken in color, but they will not rust. This darkening does not damage their function, which is very important for items such as water and gas pipes, taps and electrical wires. If desired, decorative items such as jewelry, light fixtures and door hardware are easily polished to restore a bright surface. Outdoors, copper and its alloys will gradually attain an attractive, stable patina that enhances the appearance of statues, roofs and other decorative and architectural items.
It is no wonder that architects and designers choose copper time and again.