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<p>[QUOTE=&quot;osullic, post: 915652, member: 25945&quot;]I&#039;m new to cointalk.com so I appreciate any help you can give me.</p><p><br /></p><p>I know it is advised against cleaning coins, but I have a small personal collection that I don&#039;t intend to sell, and sometimes I prefer to try to clean dirt off a coin so it might have a more pleasing appearance for me.</p><p><br /></p><p>I bought a &quot;coin wash&quot; that I use from time to time. I&#039;ve never had any negative results with it previously. The manufacturer is German, and by translating the label, it seems to contain &lt;5% nonionic&nbsp; surfactants, alcohol, fragrance and dye - though it doesn&#039;t really seem any more powerful than soapy water. Here is a link to a place selling it:</p><p><a href="http://www.safealbums.co.uk/Zen/index.php?main_page=product_info&amp;cPath=114_189&amp;products_id=356" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.safealbums.co.uk/Zen/index.php?main_page=product_info&amp;cPath=114_189&amp;products_id=356" rel="nofollow">http://www.safealbums.co.uk/Zen/index.php?main_page=product_info&amp;cPath=114_189&amp;products_id=356</a></p><p><br /></p><p>Today I tried to clean three 1928 Irish coins together, which are each made of 75% silver and 25% copper. The coins just had minor dirt on them, though the rims were reasonably dirty. I left the coins soaking in the coin wash for somewhere between 30 minutes and an hour before removing them to rinse in water. When I took the coins out of the wash, I noticed that one coin had left a mark on another, which appears blackish blue, and looks almost like some kind of chemical reaction to me. I&#039;m attaching a picture.</p><p><br /></p><p>I&#039;m just wondering if anyone might recognise what has happened here, and maybe know of a way to &quot;undo&quot; the damage. If not, I&#039;ll take this as my lesson not to try to clean coins again!</p><p><br /></p><p>Thanks in advance.[/QUOTE]</p><p><br /></p>

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