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<p>[QUOTE=&quot;Insider, post: 2431518, member: 24314&quot;]While I am not a chemist, I have enjoyed cleaning things including coins for 50+ years.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie12" alt="o_O" unselectable="on" unselectable="on" />&nbsp; In my opinion, whenever I see <span style="color: rgb(0, 179, 0)">bright green</span> or <span style="color: rgb(255, 77, 77)">red</span> encrustations on a copper/bronze coin, 99% of the time it is active corrosion.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" />&nbsp; The key word here is BRIGHT (active).</p><p>&nbsp;</p><p>As I wrote, I believe most ancient collectors call anything <span style="color: rgb(0, 179, 0)">green</span> on a copper/bronze coin &quot;patina.&quot;&nbsp; When the surface has &quot;set&quot; it is no longer active and the green patina protects the coin from further deterioration.&nbsp; Bronze disease can be brown, green, whatever.&nbsp; I think of it as acid rust .&nbsp; The OP&#039;s coin has active green RUST residue that is eating it away.&nbsp; Nevertheless, it will not dissolve away until long after we are gone so many more collectors will be able to enjoy its beauty.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /></p><p>&nbsp;</p><p>PS That &quot;green&quot; is also a little too &quot;modern-looking&quot; if you get my drift...[/QUOTE]</p><p><br /></p>

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