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<p>[QUOTE=&quot;dougsmit, post: 2287992, member: 19463&quot;]I believe the process of surface enrichment is considerably over stated.&nbsp; It does no good on good silver.&nbsp; I would not expect the layer to be thick enough to do more than make the color better.&nbsp; When can it be proven to start?&nbsp; Certainly it was used when the content approached billon but not when they were using Sterling or coin silver.&nbsp;&nbsp; The observation is that Flavians in the market are more often worn.&nbsp; Are you saying that coins of the next century that are that worn just don&#039;t make it to market because no one wants them but they are as common?&nbsp; I do not have references for things I was taught when I started in the hobby.&nbsp; Maybe it is an old wives tale. </p><p><br /></p><p><a href="http://www.totalmateria.com/page.aspx?ID=CheckArticle&amp;site=ktn&amp;NM=239" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.totalmateria.com/page.aspx?ID=CheckArticle&amp;site=ktn&amp;NM=239" rel="nofollow">http://www.totalmateria.com/page.aspx?ID=CheckArticle&amp;site=ktn&amp;NM=239</a></p><p>This page states that alloys finer than sterling are too soft for practical use. </p><p><img src="http://riograndeblog.com/wp-content/uploads/2012/11/CAllendenHardness3.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><a href="http://riograndeblog.com/2012/11/metal-hardness-how-to-measure-it-and-why-it-matters-for-silver-alloys/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://riograndeblog.com/2012/11/metal-hardness-how-to-measure-it-and-why-it-matters-for-silver-alloys/" rel="nofollow">http://riograndeblog.com/2012/11/metal-hardness-how-to-measure-it-and-why-it-matters-for-silver-alloys/</a></p><p><br /></p><p>The above chart shows hardness increasing until it flattens off at about 80/20 where it stays until about 30/70 which is borderline billon.&nbsp; I&#039;d say 30% silver would certainly benefit from surface enhancement but that&#039;s not to say it would not before that.&nbsp; This is a question to ask a metallurgist, not me.&nbsp; Another matter is the chart covers AR/CU alloy but coins were never just two metals.&nbsp; It would make a difference whether the 80% silver coins had a mix of other metals that would add or subtract hardness.&nbsp; I know there are coin collector type people into this sort of question since there is a Yahoo group on metal.&nbsp; I am a member but do not read every post.</p><p><a href="https://groups.yahoo.com/neo/groups/numismet/info" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://groups.yahoo.com/neo/groups/numismet/info" rel="nofollow">https://groups.yahoo.com/neo/groups/numismet/info</a>[/QUOTE]</p><p><br /></p>

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