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<p>[QUOTE="cmezner, post: 4699649, member: 87809"]Found this here <a href="http://www.anythinganywhere.com/info/clean.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.anythinganywhere.com/info/clean.htm" rel="nofollow">http://www.anythinganywhere.com/info/clean.htm</a></p><p>when I was thinking about cleaning some WWII coins I have:</p><p><br /></p><p>"When you get an Unc piece of zinc or tin you need to put it in an inert holder immediately if not yesterday. It's probably too late already. These things suck up oxygen and grow spots in the dark. You can then clean the spots off with acid, but they ALWAYS leave pits. You can always tell when</p><p>zinc has been cleaned. Other than soapy water for dirt and organic solvent for pvc scuzz (you're probably too late) I wouldn't bother trying to clean zinc or tin."</p><p><br /></p><p>and at this site (German):</p><p><a href="http://www.sammlermuenzen.de/muenzen-sammeln/muenzen-reinigen/#zink" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.sammlermuenzen.de/muenzen-sammeln/muenzen-reinigen/#zink" rel="nofollow">http://www.sammlermuenzen.de/muenzen-sammeln/muenzen-reinigen/#zink</a></p><p><br /></p><p>they say that zinc is a base metal that oxidizes easily forming a gray to white coating. Zinc is not easy to clean. The easiest way is to use sodium bicarbonate. The gray to white coating can be transformed into the original dark gray color of zinc with gun oil, which probably has the same effect as Renaissance Wax</p><p>Worst of all is the zinc pest against which there is no cure.</p><p><br /></p><p>This is the original recommendation in German:</p><p>"Zink ist ein unedles Metall und oxidiert leicht, dabei bildet sich dann ein grauer bis weißer Überzug. Schlimmer noch ist die Zinkpest oder der Zinkfraß. Dagegen gibt es leider kein Mittel. Das eher unansehnliche Metall ist nicht leicht zu reinigen. Am besten versuchen Sie es mit Natronpulver. Den grauen bis weißen Belag verwandeln Sie mit etwas Waffenöl (z. B. Balistol, gibt es für wenig Geld im Baumarkt) wieder in die ursprüngliche dunkelgraue Farbe von Zink. Sollte die Münze bereits von der sogenannten Zinkpest oder dem Zinkfraß befallen sein, gibt es dagegen kein Mittel." </p><p><br /></p><p>Hope this helps <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>
[QUOTE="cmezner, post: 4699649, member: 87809"]Found this here [URL]http://www.anythinganywhere.com/info/clean.htm[/URL] when I was thinking about cleaning some WWII coins I have: "When you get an Unc piece of zinc or tin you need to put it in an inert holder immediately if not yesterday. It's probably too late already. These things suck up oxygen and grow spots in the dark. You can then clean the spots off with acid, but they ALWAYS leave pits. You can always tell when zinc has been cleaned. Other than soapy water for dirt and organic solvent for pvc scuzz (you're probably too late) I wouldn't bother trying to clean zinc or tin." and at this site (German): [URL]http://www.sammlermuenzen.de/muenzen-sammeln/muenzen-reinigen/#zink[/URL] they say that zinc is a base metal that oxidizes easily forming a gray to white coating. Zinc is not easy to clean. The easiest way is to use sodium bicarbonate. The gray to white coating can be transformed into the original dark gray color of zinc with gun oil, which probably has the same effect as Renaissance Wax Worst of all is the zinc pest against which there is no cure. This is the original recommendation in German: "Zink ist ein unedles Metall und oxidiert leicht, dabei bildet sich dann ein grauer bis weißer Überzug. Schlimmer noch ist die Zinkpest oder der Zinkfraß. Dagegen gibt es leider kein Mittel. Das eher unansehnliche Metall ist nicht leicht zu reinigen. Am besten versuchen Sie es mit Natronpulver. Den grauen bis weißen Belag verwandeln Sie mit etwas Waffenöl (z. B. Balistol, gibt es für wenig Geld im Baumarkt) wieder in die ursprüngliche dunkelgraue Farbe von Zink. Sollte die Münze bereits von der sogenannten Zinkpest oder dem Zinkfraß befallen sein, gibt es dagegen kein Mittel." Hope this helps :-)[/QUOTE]
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