Message:

<p>[QUOTE=&quot;Leadfoot, post: 1242233, member: 2972&quot;]While it is true that toning is more visible at different angles when it gets thicker, that&#039;s not the reason for the phenomenon you describe.&nbsp; More to the point, I believe the difference in toning is what you call &quot;universal angle&quot; toning is prevalent on business struck coins (or coins with luster), whereas &quot;oblique angle&quot; toning show up on proof or prooflike coins.&nbsp;&nbsp; They are both caused by the same phenomenon (thin film interference), but the difference in the surfaces underneath cause the different properties.&nbsp; Said a bit differently, the &quot;bumpy&quot; luster typical on a business struck coin causes light to be scattered in all directions and thus the toning is visible in all directions, whereas a proof or prooflike coin with much more regular surfaces reflects light through the toning the best at a certain angle.&nbsp; It&#039;s the surfaces underneath that make the difference, not the toning.&nbsp; IMO of course...Mike[/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