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Message:: [QUOTE="coin hoarder, post: 1104370, member: 29310"]Hi All, I joined this group because while I was going through old jewelry, yesterday, I found an old Chinese coin that I wanted to find more information on. That was very successful. Through internet research and with the help of a member of this group, I know pretty much everything about the coin except for the value. That was always secondary anyway, and I will learn that soon enough. This search spurred me to get out the other old, foreign coins that I have. I got them about 20 years ago, when my grandmother passed away. She was one of 8 or 9 children, and was given them by her brothers, returning from the wars. WWI, WWII and the Korean "Conflict". I was very disappointed when I retrieved them to find oxidation(?) on some of the nazi coins, heavy tarnish(?) on some of the silver, brass and copper coins, and some of the plated coins looked like there plating had been "eaten" away. Some of the nazi coins had white crusted spots on them. I'm pretty sure that some type of chemical reaction has occurred as a result of storing all of these metals together in a plastic bag for all these years.  I, of course, now know that this was a horrible mistake, so please refrain from any admonishments. I am just asking for your help and advice in trying to salvage as many of these coins as I can. Can a product like Tarn-X be used safely? Thank you,Barry[/QUOTE]