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<p>[QUOTE=&quot;1991retiredarmy, post: 196847, member: 5586&quot;]SMULLEN,</p><p>Sulfur usually is the cause. Old coin albums had it in the paper they were made of. Also the air in the enviroment can tone coins. If you have a silver coin with little value dip it in bleach and watch it turn steely grey. Place sulfer on the coin for a few days watch what happens. Iodine left on coins leaves another type of tonning. People who try cleaning their coins try to tone them somewhat after words trying to hide the effect by leaving them on outside windowsills for a few months to get them to retone a bit. Some people bake them in a low temp oven coated with oil. There are many ways to produce artifical toned coins. High humidity also affects coins, especially if you live near saltwater. That is why they reccommend buying slabbed coins at first until you can see the difference. There are many books out there &quot;The Coin Collector&#039;s Survival Manual&quot;,&quot; Coin Collecting for Dummies&quot;, &quot;Coin Chemistry&quot;, &quot;the Expert&#039;s Guide to Collecting &amp; Investing in Rare Coins&quot;. These are but a few. Go to your local library or book store look in the index of the book for coin cleaning and coin tonning. Find the book you like and buy it. Also get yourself a copy of &quot;Photograde Coin Grading Guide&quot; it will help you greatly. Be wise in buying these books, look on Amazon.com first it&#039;ll same you a bunch of money. I just bought a copy of The Standard Guide of World Coins at the bookstore and paid $60 after taxes when it was listed on Amazon for $38 postage included.&nbsp; Hope this explains some and good luck in your collecting.[/QUOTE]</p><p><br /></p>

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