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Message:: [QUOTE="Just Carl, post: 101648, member: 4552"]All tarnishing can be stopped on coins depending on just how far you want to go to stop the reaction. For Silver and copper coins, just remove the air, moisture & contaminates from the coins presence. There are plastic bags and devacumination devices that will take the air out of a plastic bag with your coins in them. For instance I've got Mercury Dime Collections in Whitman Classic Albums that are in a large plastic sealable clear bag, The ones I first put there back about 40 to 50 years ago still look the same. However, to be sure it is working, I'll look again in a few hundred years and let you know. Same thing for Lincoln Cent Albums and many others. Each in a baggy and sitting in a bank safe deposit box. I've made paper weights and pen holders out of liquid plastic and put coins in there and no tarnishing for the last 30 years or so. None of the coins I've put in those little 2x2's have shown much tarnishing also. They are in cardboard boxes and just kept in a dry invironment. Remember it is the Oxygen that causes a lot of the problems. Although in the form of Sulfites, Sulfates, Nitrites, Nitrates and just lots of other air bound contaminates that do most of thier damage to any object, they must be in the presense of Moisture to react. If you keep your coins in basically moisture free invironment, the chances of toning, tarnishing, etc are deminished considerably.[/QUOTE]