Message:

<p>[QUOTE=&quot;desertgem, post: 639733, member: 15199&quot;]Stability of color is for the most part non-existent as a characteristic. From the basal color of a coin, it is a natural incline of coloration due to chemical reactions such as sulfide layers. The progress up this hill to dark brown for copper can be slowed or suspended under the best of storage conditions, but it is capable of restarting in the presence of environmental factors whether it is in a slab, airtite, or sitting raw. Only in a tight vacuum or unbelievable luck of environment, would we expect to see no change in our lifetime. The incline slows as protective patina covers the metal, so change would be less in a RB coin than a RD coin under the same conditions over say 50+ years.</p><p>Even slabs need protection against the process.</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