Message:

<p>[QUOTE=&quot;desertgem, post: 1199858, member: 15199&quot;]Hi Sarah,</p><p><br /></p><p>&nbsp;&nbsp;&nbsp; Take a look at the microscopic view of lustre in this post to see how the flow lines are radially oriented in the fields ( move generally from the center to the edge). These flow lines give what is called lustre as well as the &quot;wagon wheel&quot; effect when tilting the coin. These ridges wear down and lustre decreases.</p><p><br /></p><p><a href="http://www.cointalk.com/t126215/" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/t126215/">http://www.cointalk.com/t126215/</a></p><p>&nbsp;Whizzing is a means of artificially producing a similar surface by scratching lines so there is a raised and lower level, that reflects light. The previous difficulty with this is that most attempts produce lines in a circumference&nbsp; direction such as by a rotating tool as mentioned, or if done by a reciprocating tool or by hand ,across the coin.</p><p><br /></p><p>&nbsp;&nbsp; &nbsp; With flow lines , they originate at the edge of the devices on the coin and cross the fields. Whizzing generally either go over the devices ( easier to detect), or piles metal up on the edge of the device or they gap away form the devices. Luster in general does none of these.&nbsp; However, skill of whizzing may make it difficult for beginners to detect, but most of the success was in earlier times, when not as much emphasis was put on coin surfaces as today.&nbsp; Today, also tools have improved, and there are rumors of computer driven. variable strength lasers, that can score the surface, skipping raised areas, and be even more difficult to detect. I think PCGS states someplace they can detect it on their high value services. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in