Bismuth has a reddish white metallic luster, and is found as a pure metal, or in compounds as a sulphide. The ore is first roasted to oxidize the arsenic and sulphur, and is then mixed with carbon and iron filings and melted in a crucible. The metal collects in the bottom of the crucible. Bismuth is chiefly used because of its extreme fusibility, as it melts at 270° F., while its alloys melt at even a lower temperature.