The chief source of tin is tinstone (or cassiterite) SnO2. Tin is a bright shining white metal. It is soft and malleable and can be made into the form of thin foil. As it has high resistance to corrosion, it is used for coating purposes on metals and alloys. It is particularly used in low melting point alloys as a substitute for bismuth. It is also widely used for moisture-proof packing.
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