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<p>[QUOTE=&quot;lawdogct, post: 107209, member: 1476&quot;]The most adventurous I&#039;ve been....well on coins that I&#039;d keep if I removed the junk on them, is grey electrical tape.&nbsp; It doesn&#039;t leave a black gooey residue like black electrical tape, and is flexible enough to be pressed in between the details on a coin.&nbsp; Removes 50 years of dirt off a wheatie, but won&#039;t do much for corrosion or finger prints.</p><p><br /></p><p>The most tortuous I&#039;ve been to a coin was to sandwich a nickel between two zinc lincolns, wrap them in aluminum foil in such a way as a long portion of it forms a handle...then set it on the kitchen burner, flipping often to keep the foil from melting.....</p><p><br /></p><p>the zinc melts before the copper with some odd results...and the nickel is left perminantly blackish....mainly b/c it was literaly sintered.&nbsp; Was really hoping it would turn a more interesting color than black....but I&#039;m no chemist.</p><p><br /></p><p>But yah, bottom line is as others have stated...there is no known surefire means of cleaning without damage.[/QUOTE]</p><p><br /></p>

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