Message:

<p>[QUOTE=&quot;desertgem, post: 746916, member: 15199&quot;]Really need a photo, but in the mean time, there is a very intriguing article by an expert Mike Diamond who is a member here also, in Coin World 11/30/09 pg. 124 called &quot;Unknown annealing drum problem cause of discoloration&quot;. He mentions some examples that are extremely confusing but interesting from the metallurgy and physical chemistry viewpoint ( at least to me). Copper discoloration is the primary one discussed.</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