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<p>[QUOTE=&quot;GDJMSP, post: 4982216, member: 112&quot;]Studies ? Not to my knowledge. But what we do have are centuries worth of experience and history of what various coin storage methods have resulted in. What has actually happened to the coins. And that result is the vast, vast majority of coins have been irreparably damaged and or destroyed by improper storage.</p><p><br /></p><p>And there&#039;s a good bit more to it than that for we must also take known facts into account. The most important of which is - all coins tone beginning the very moment they are made. And, toning is corrosion and corrosion unquestionably damages the coins, will literally destroy them if left unchecked. It is not a question of if, it is merely a question of when.</p><p><br /></p><p>We&#039;ve learned from all of these things. And it is the learning, the gaining of that knowledge that has to brought us to recommended storage methods that we have now. Methods that didn&#039;t even exist as little as 50 years ago - after more than 2,000 years of coin collecting. And most of those methods were not widely accepted even 20 years. In point of fact there still resistance to accepting them now - today. You apparently are a prime example of that.</p><p><br /></p><p>Now, it must also be understood that when it comes to coin storage methods, regardless of which methods one uses, there are a thousand, ten thousand variables involved. And those variables result in different outcomes. And most of those variables, most people don&#039;t even realize they exist.</p><p><br /></p><p>For example, if you take a 100 people and all of them store their coins in cardboard albums for 30 years, you&#039;re going to get thousands of different results when it comes to the individual coins. If one collector has 200 coins in his albums, he&#039;s probably going to get 100 different results all by himself. All of the coins will be toned to some degree, it&#039;s just a question of what degree. Some may be toned completely black, while others may be colorful, others may be the common steel grey, and still others toned but not a whole lot. And that&#039;s with just 1 collector and 200 coins. And all in the same 2 or 3 or 4 albums.</p><p><br /></p><p>Another collector, the majority of his coins may have ugly dark toning on them, some terminal toning. A few may even be attractive, but only a few.</p><p><br /></p><p>Then consider that everything in your home, literally everything, has an impact on how the coins will tone. From the carpet or floor coverings you have to the paint on your walls, the type of heating system you have, A/C or lack thereof, to your kitchen stove and what you cook for dinner and how you cook it - literally everything has an impact on how the coins will tone. These are all scientific facts, not something open to debate.</p><p><br /></p><p>You beginning to see the possibilities ? Now throw in all of the people who use cardboard 2x2s, then all of those who use coin envelopes, then all of those who use original mint packaging, then all of those who use coin flips, and and and.</p><p><br /></p><p>Ya see GoldFinger, it&#039;s really simple when ya get right down to it - the enemy of coins is air. That&#039;s it, air - and everything contained in the air, and that of course includes humidity. This is a fact, plain and simple. So to protect your coins to the best of your ability you have to protect them from the air. And to do that you restrict the air flow that can get your coins as much as possible. And you do that with the storage methods I&#039;ve recommended previously in this and countless other threads.</p><p><br /></p><p>Then there&#039;s temperature changes. It is also a fact that temperature variances, especially large ones, increase or speed up toning. So to prevent that you store your coins where the temperature remains as close to constant as you can get.</p><p><br /></p><p>Toning cannot be stopped, but it can be slowed down. And if you do everything you can, it can slowed significantly.</p><p><br /></p><p>Your original question was - how harmful ? Well, there is no cut and dried answer because of all the variables involved. You cannot ever know how harmful it&#039;s going to be until it&#039;s too late. </p><p><br /></p><p>So the real question is not how harmful, but rather do you wish to risk the harm, and perhaps even destruction, that you know for a fact is possible.[/QUOTE]</p><p><br /></p>

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