A relatively constant, moderate temperature and low humidity are preferable for long-term storage of coin collections. Placing packets of silica gel in the coin storage areas also helps to control atmospheric moisture.
Paper coin envelopes are sometimes used for the storage coins. Be sure to use envelopes made specifically for holding coins or, in time, your coins may change colour (natural toning) because of a reaction with chemicals present in the paper. If you are using paper envelopes a 2x2 coin storage box is the least expensive method to hold your coins.
Various brands of coin folders and coin albums are available and can be an attractive way to present you collection, if used with a good quality coin envelope that does not contain any harsh chemicals that will react with the coins.
Plastic coin flips are available in various materials. "Soft" flips are made from polyvinyl chloride (PVC) which decomposes over time with disastrous results for coins and are therefore not suitable for long-term storage.
Mylar and acetate flips do not contain PVC, but they are hard and brittle and may scratch the coins if these are not very carefully inserted and removed. While not airtight, they are reasonable choices for moderate value coins that will be "left alone" for a number of years, but less so for coins that are to be shipped or that will be removed and reinserted.
Mylar-lined cardboard, often called "2x2s" but also available in other sizes, are similar to plastic flips. A coin is placed between the two halves, which are then stapled together (some brands contain an adhesive).
Coin tubes are plastic containers designed to hold a number of the same size coins and they are fine for bulk storage of circulated coins and can also be used for higher-grade coins, provided the coins do not move. A distinct disadvantage is that the coins cannot be viewed without being removed from the tube.
Hard plastic coin holders are preferable for more valuable coins. They are not known to contain any materials that harm coins and also offer good protection against scratches and other physical damage. They are available for both individual coins and small sets.
Slabs are sonically sealed hard plastic holders for individual coins. They offer good (though still not perfect) protection. Because of the expense of having a coin slabbed, they are generally suitable only for more valuable coins.
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