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<p>[QUOTE=&quot;satootoko, post: 119828, member: 669&quot;]<img src="http://www.cosgan.de/images/more/schilder/142.gif" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> to CoinTalk guy.</p><p><br /></p><p><u>P l e a s e</u> use the search button at the top of the page and read some of the multitude of prior threads on cleaning.</p><p><br /></p><p>Bottom line, unless your coin has some kind of corrosion that is eating away coin metal <u>leave it alone</u>.</p><p><br /></p><p>Gold doesn&#039;t normally corrode, especially .900 pure gold like the Mexican 1947 50 Peso, but your description could conceivably be of a coin with an uneven alloy mix, resulting in a noticeable copper spot.&nbsp; Please post a picture of the coin so some of the real gold experts can eyeball it.</p><p><br /></p><p>If it were mine, and had the problem you describe, I would certainly consider sending it to NCS for professional conservation because of its value, but I would never, ever, even think of trying to &quot;clean&quot; it myself. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie9" alt=":eek:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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