"Precious metal", this special noun is often mentioned by people. However, have you got what is precious metal?
Precious metal mainly refers to gold, silver and platinum group metals (ruthenium, rhodium, palladium, osmium, iridium, platinum), etc. 8 kinds of metal elements. Most of these metals are have a charming color and great resistance to the chemicals. They will not easy to cause chemical reaction in general condition. They are not only used to created variety of jewelry and souvenirs, but a wide range of industrial uses.
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