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Attached are photos of a New Mexico quarter I found in a bank roll that did something curious. After picking out this quarter I placed it in a sonic jewelry cleaner with distilled water and disolved ivory bar soap overnight (not running). In the morning I turned on the sonic cleaner for about 30 minutes and when I took the coin out of the distilled water, it was curiously toned (rusted?). When I placed the coin in the distilled water it was not toned, just a little dirty. I have soaked a number of state quarters before with no "toning" occurring. What would cause this particular quarter to tone in this way after soaking in distilled water and ivory soap?
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CONECA (pronounced: CŌ´NECA) is a national numismatic organization devoted to the education of error and variety coin collectors. CONECA focuses on many error and variety specialties, including doubled dies, Repunched mintmarks, multiple errors, clips, double strikes, off-metals and off-centers—just to name a few. In addition to its website, CONECA publishes an educational journal, The Errorscope, which is printed and mailed to members bimonthly. CONECA offers a lending library, examination, listing and attribution services; it holds annual meetings at major conventions (referred to as Errorama) around the country.
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