Terne is an alloy of lead and tin, which is primarily used in the production of roofing materials. It is a soft metal that is easy to shape and form, making it ideal for use in roofing applications. The alloy is composed of 90% lead and 10% tin, and is often used in combination with zinc to create a more durable material. Terne is also used in the production of coins, as well as in some decorative items.