Flexible vinyl envelopes are used by auction houses for the storage of coins, as during the pre-sale viewing process many people may wish to view the pieces, and the auction houses do not want the surfaces of the coins to be touched. However, once the sale takes place the new owners should remove coins from these envelopes immediately and transfer them to hard plastic or other containers. Clear Capital (brand) and similar lucite holders, on the market for several decades, have proven to be excellent for storage of coins and will protect them against the elements. KoinTains, made of pieces of plastic which snap together to cover a coin, have likewise stood the test of time. Certain other commercial products are similarly useful. Before committing your collection to a particular type of storage mode, check with a professional numismatist or a long-term collector and get an opinion or two. It is better to be careful than sorry.
Even when coins are carefully housed in slabs, clear lucite holders, or KoinTains, they should be kept away from light and, especially, heat, as both can cause discoloration over a period of time.
The handling and storage of coins is a simple matter, and one not to become worried about. If a few basic precautions are followed, you can enjoy your coins with the assurance that as long as you own them they will be preserved in the same grade in which they were acquired.
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PCGS Coin Guide Table Of Contents