Indoors, copper and its alloys will very slowly darken in colour, 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. Decorative items such as jewellery, light fittings and door furniture are easily polished to restore a bright surface. Outdoors, copper and its alloys will gradually form an ttractive, stable green 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 gain. Copper pipes were used by the Ancient Egyptians to carry water. Today, copper tube is used in many European homes to carry hot and cold water for plumbing and heating and to safely onvey natural gas to homes and businesses.