Tin has been extracted from ore since the beginning of the Bronze Age, about 3000 years B.C., most commonly from its ore Cassiterite. The Latin name "Stannum" came to mean Tin in the 4th century. Tin reacts with acids and alkalis but resists corrosion from water. Tin is used as a protective coating for other metals as a protective oxide layer prevents further oxidation. Tin can be highly polished. Treatment of window glass with salts of tin produces electrically conductive coatings, such as those allowing the glass to be switched into opaque mode.
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