Message:

<p>[QUOTE=&quot;Bonedigger, post: 80605, member: 4367&quot;]Two main reasons are the air and sulfur.&nbsp; Sulfur was used by the US Mint on the 1K coin silver dollar bags which prevented deterioration of the fabric.&nbsp; Any coin which came into contact with this material was going to tone somewhat and with the US Mint keeping these bags lockd up for many, many years there were some surprises to be had for sure... </p><p><br /></p><p>High sulfur content envelopes will cause this alchemic transformation as well.&nbsp; Coin envelops (go figure <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />) and the philosophers stone <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /> are notorious for speeding this process along.</p><p><br /></p><p>There are several excellent reads on the topic.</p><p><br /></p><p>Bone[/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