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<p>[QUOTE=&quot;svessien, post: 4206048, member: 15481&quot;]I read a bit about bronze disease today. It comes from chlorine in the ground that reacts with air, water and copper, and as we all know it can ruin a coin.</p><p>I think it is the responsibility of every collector to contribute to the preservation of these historical «documents» that we have in our custody. That means that we should do our best to remove dirt and encrustations from our coins, without altering the original surfaces, before storing them in a dry and preferably air tight environment. I always have a jar full of coins and distilled water/olive oil, and a coin box where the candidates dry up before getting a (sometimes not so) gentle brush. Preservation is one of the best parts of collecting, in my opinion. </p><p><br /></p><p>My two quadrans.[/QUOTE]</p><p><br /></p>

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