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<p>[QUOTE=&quot;petro89, post: 1656248, member: 17048&quot;]Any exposure to air/gasses/material/another object could cause a coin to change over time.&nbsp; The best thing you can do is keep the coin in a slab (if its value warrants) or an airtite holder.&nbsp; This is step one.&nbsp; The 2nd step is considering where the coin is stored.&nbsp; They need to be in a dry place because moisture is definately an enemy.&nbsp; If you have your coins in a safe for example, you need to be using dessicant or silica gel to absorb the moisture and keep things nice and comfy for your collection.&nbsp; The proper holder and the proper storage will keep your coins how you want them for the most part, and keep your toning looking nice.&nbsp; You can&#039;t stop it 100% but with the proper measures you can slow down any coin changes to where they&#039;re not really noticeable at all even through the years.[/QUOTE]</p><p><br /></p>

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