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<p>[QUOTE=&quot;zumbly, post: 2554148, member: 57495&quot;]Naturally formed patina protects our ancient bronze coins. In every instance, a nice patina will also increase (and sometimes greatly increase) its market value because collectors of ancients just like how they look. Conversely, a coin that has been stripped of this patina will lose appeal to the eyes of most collectors and hence value. </p><p><br /></p><p>Here&#039;s a page which covers the basics of patinas quite well:</p><p><a href="http://www.calgarycoin.com/reference/grading/patina.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.calgarycoin.com/reference/grading/patina.htm" rel="nofollow">http://www.calgarycoin.com/reference/grading/patina.htm</a></p><p><br /></p><p>The purplish patches on my coin are what are left of raised mineral lumps formed by the corrosion of the copper in those areas. The coin was &quot;smoothed&quot; to make the surfaces more even. Most collectors would probably consider large mineral lumps sitting on top a coin to detract from its appearance, especially so if they obscure parts of the coin&#039;s design.[/QUOTE]</p><p><br /></p>

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