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2. Precious metal - Wikipedia

   en.wikipedia.org/wiki/Precious_metal

   The best known precious metals are the precious coinage metals, which are gold and silver. Although both have industrial uses, they are better known for their uses in art , jewelry , and coinage. Other precious metals include the platinum group metals: ruthenium , rhodium , palladium , osmium , iridium , and platinum , of which platinum is the ...

3. Hierarchy of precious substances - Wikipedia

   en.wikipedia.org/wiki/Hierarchy_of_precious...

   Ancient Greek mythic-cultural cosmology depicted a decline from a golden age to a silver age followed by an Iron Age. In some variants there is a Bronze Age, an interim between the Iron Age and Silver Age. In Japan, the traditional Sho Chiku Bai (松竹梅) ranking system has a hierarchy of pine 松 (matsu), bamboo 竹 (take), and plum 梅 (ume ...

4. Conservation and restoration of silver objects - Wikipedia

   en.wikipedia.org/wiki/Conservation_and...

   Silver is known in the chemistry world as a noble metal, which means it is resistant to corrosion, but not completely immune. Whether silver plating or pure silver, the composite of the metal will tarnish when exposed to air and sulfur. Tarnish is a chemical reaction on the surface of metal (copper, brass, silver, etc.) and causes a layer of ...

5. Elemetal - Wikipedia

   en.wikipedia.org/wiki/Elemetal

   In 2015, Bill LeRoy, the president of Ohio Precious Metals was named the company's CEO and the company changed its name to Elemetal. In March 2017, Juan P. Granda a former employee of NTR Metals, Miami was charged with buying gold from illegal mines in Peru. [ 1 ]

6. List of bullion coins - Wikipedia

   en.wikipedia.org/wiki/List_of_bullion_coins

   Bullion coins are government-minted, legal tender coins made of precious metals, such as gold, palladium, platinum, rhodium, and silver. They are kept as a store of value or an investment rather than used in day-to-day commerce. [1]

7. Engelhard - Wikipedia

   en.wikipedia.org/wiki/Engelhard

   An Engelhard silver bar An Engelhard poured 2 oz 99.99% pure gold bar. Engelhard Corporation was an American Fortune 500 company headquartered in Iselin, New Jersey, United States. It is credited with developing the first production catalytic converter. In 2006, the German chemical manufacturer BASF bought Engelhard for US$5 billion.