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<p>[QUOTE=&quot;alurid, post: 3060024, member: 81991&quot;]This is what some jewery makers use to color there metals.</p><p>As we know people are color orientated.It helps the product sell.</p><p>lots of youtube vids.<a href="https://www.sciencecompany.com/Patina-Chemicals-Patina-Book-C672.aspx?s=Name%20ASC&amp;p=1" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.sciencecompany.com/Patina-Chemicals-Patina-Book-C672.aspx?s=Name%20ASC&amp;p=1" rel="nofollow">https://www.sciencecompany.com/Patina-Chemicals-Patina-Book-C672.aspx?s=Name ASC&amp;p=1</a></p><p><br /></p><p>Patina on a coin can show that it has not been cleaned/dipped. It takes a long time for this to develope naturaly which can give it an added premiun.</p><p>It is called Tannish if it is not wanted, and Patina if it is wanted.</p><p>it&#039;s all a type of oxidiation, Google Rainbow Toning and click Images.[/QUOTE]</p><p><br /></p>

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