Message:

<p>[QUOTE=&quot;Colonialjohn, post: 3371724, member: 57741&quot;]In simpler terms whenever you place a more oxidizable metal (Zn) UNDER a lesser oxidizable metal (Cu) its going to want to make its way to the surface - eventually. Interesting note - those silver 8R&#039;s from the EL CALZADOR wreck - see here:</p><p><br /></p><p><a href="https://www.ebay.com/itm/1783-Mo-FF-Mexico-8R-El-Cazador-Genuine-NGC-SHIP-WRECK-COIN/273682994469?hash=item3fb8c71525:g:6M4AAOSwlzRacQ4R:rk:37:pf:0" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ebay.com/itm/1783-Mo-FF-Mexico-8R-El-Cazador-Genuine-NGC-SHIP-WRECK-COIN/273682994469?hash=item3fb8c71525:g:6M4AAOSwlzRacQ4R:rk:37:pf:0" rel="nofollow">https://www.ebay.com/itm/1783-Mo-FF-Mexico-8R-El-Cazador-Genuine-NGC-SHIP-WRECK-COIN/273682994469?hash=item3fb8c71525:g:6M4AAOSwlzRacQ4R:rk:37:pf:0</a></p><p><br /></p><p>Doing XRF surface analysis they generally read 98-99% Ag rather than 92%. With well worn salt water exposed 8R shipwrecked pieces most of the Cu (more oxidizable metal) has LEACHED OUT of the alloy giving it these high Ag readings. Same process with Zn wanting to escape out from under the copper plate.</p><p><br /></p><p>John Lorenzo[/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