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<p>[QUOTE=&quot;Just Carl, post: 114251, member: 4552&quot;]2) There is probably no changing your mind on this one but I have seen hundreds upon hundreds of old circulated coins that have not tarnished at all. Coins are not made to tarnish, coins only tarnish when put under the right circumstances. (unfortunately these circumstances are very common) ps. sulfur causes toning on silver, Sulfur is not found everywhere. Sulfur only occurs in high enough concentrations as a result of smoking, etc. therefore not all silver coins have tarnish!</p><p><br /></p><p>Only partially true. Yes Sulfur is one of the most common tarnishing effects on Silver which becomes Ag2S ( excuse the lack of lower case numbers). However, there is also 3Ag2O, AgNO3, etc. Sulfur is actually very, very common in our air and is one of the most destructive air born compounds we have in the air. It is present everywhere due to the burning of Sulfur rich coal in power stations, factories, founderies, etc. The after effects of this is SO or SO2 pushed into the air and when in contact with moisture, H OH otherwise known as H2O, it becomes an air born acid (H2SO3 or H2SO4) which attacks everything. That is why all Silver coins, silver dinnerware, etc.&nbsp; everywhere there is air becomes toned otherwise none as tarnish. The tarnish that is formed is Ag2S and if removed in any form from a coin will take the Ag (Silver) with it. There are other lesser known air born contaminates such as the NO3 radical in moisture forming an acid which also creats a Silver Nitrate but much, much less prevelant except in loosely controlled chemical factory areas of the country. Even just plain old air can attact Silver forming 3Ag2O but also takes a long, long time.</p><p>Regardless of the type of contaminate that effects all Silver coins, the removing (cleaning) dose in fact remove some of the Silver. It has to. Cleaning that removes a&nbsp; Silver Sulfite, Sulfate, Nitrate or Oxide must take the Silver with it. ]</p><p>Summation is to NOT clean coins.[/QUOTE]</p><p><br /></p>

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