Platinum (disambiguation)
Platinum is a chemical element with symbol Pt and atomic number 78.
Platinum coin
Platinum coins are a popular investment, and each year the number of such coins sold by Sberbank of Russia increases by 30–50%. Most experts agree that such investments should have a long-term character, as the rise of the platinum price is relatively slow – about 80% over the last 5 years, except for a rapid rise followed by decline in 2008. Also, whereas most banks can sell platinum coins, only a few buy them, as this requires evaluation by an experienced professional. For example, only 5% of offices of Sberbank (the major bank of Russia) in the capital city of Moscow redeem precious metal coins. The selling price is also much affected by visible scratches, spots, patina, and other defects introduced by bad handling. For this reason, most bullion coins are sealed in transparent plastic right after removal from the press. They are then stored in a dry room with relative humidity below 80% and at temperatures between 15 and 40 °C. If a coin is removed from its plastic seal, it is recommended not to store it in PVC albums, as PVC molecules gradually break down, releasing organochlorine compounds which produce patina on the coins. These compounds may also form acids by reacting with moisture. Unlike silver, platinum does not corrode. However, as is true for all unprotected coins, platinum coins are prone to contamination which can be caused even by washing with (chlorine-containing) tap water.