Message:

<p>[QUOTE=&quot;robinjojo, post: 24704520, member: 110226&quot;]Do you have a photo of the coin before the toning?&nbsp; Gold is not a reactive metal, and it takes a long time for a gold coin to acquire color, caused by the alloy mixed with the gold, usually copper.&nbsp; The only other cause might be instability with the plastic used for the slab?&nbsp; I don&#039;t think this the case; hard plastic, unlike PVC plastic, should have any leaching chemicals.</p><p><br /></p><p>As for putty or some other material applied to mask damage or a flaw, I don&#039;t think that is the case.&nbsp; The surface just looks as if a thin deposit of some substance over time darkened.&nbsp; I had a broad 1 1/2 thaler from the 17&#039;th century that had a hole repaired with wax.&nbsp; The wax was colored to match the silver tone of the coin.&nbsp; This was a very old fashion way of repairing holes.[/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