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<p>[QUOTE=&quot;miker, post: 53685, member: 3054&quot;]The only metal that does not tone naturally is gold.&nbsp; It may be possible to tone it artificially but I am unsure of that.&nbsp; Gold does not react with corrosives (salt water, etc) so maybe artificial wouldn&#039;t work either.&nbsp; But the environment that you live in or keep the coin in will detemine what will happen.&nbsp; Coin collectors in Hawaii must have a real hard time with toning, due to the humidity.&nbsp; And Nevada/Arizona must be the best, as long as the coin is kept away from corrosives.&nbsp; Paper when it is made has a sulfur content so when you combine the sulfur with the humidity, you create sulphuric acid.&nbsp; That is why those Whitman holders are so hard on coins.&nbsp; Since no coin holder is airtight, the only alternative is to store the coins in a low humidity environment.&nbsp; A lot of safes have a renewable dessicant (absorbs humidity) and the airtight nature of the safe adds to the protection.[/QUOTE]</p><p><br /></p>

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