Message:

<p>[QUOTE=&quot;BAJJERFAN, post: 2130459, member: 74330&quot;]Well, you could solicit on the PCGS or NGC message/BST boards to buy a couple spotted ones like like I did. The pics were posted earlier. I can tell you already that sodium thiosulfate won&#039;t work, nor will ammonia solution. Sulfuric acid is ineffective as well. Ezest will work if you dip BEFORE the spots become visible. That was the dip that Russ was referring to in the linked thread. Acetone won&#039;t work either.</p><p><br /></p><p>It has been said that the incipient spots can be seen with use of a halogen flashlight BEFORE they become visible to the eye. At that point it is sill possible to remove them. I never really looked into this much. </p><p><br /></p><p>Under high magnification, the spots tend to be found on areas of the coin surface that have the roughest finish. I don&#039;t have photos of those, but here is a SEM scanning electron microscope micrograph of a silver eagle coin.</p><p><br /></p><p><img src="http://i1164.photobucket.com/albums/q580/BAJJERFAN/MISCELLANY%20COINS/2_zpsd74505cb.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Interesting comment/s about silver chloride.&nbsp; I hadn&#039;t considered that as the cause for the tea colored spot. The spot on the one coin that I had examined by ESCA was white. FWIW, there was NO SODIUM present in the white spot, just silver and chlorine.</p><p><br /></p><p>The following linked webpage has similar observations about AgCl and why it might be so hard to dissolve.</p><p><br /></p><p><br /></p><p><a href="http://www.saltlakemetals.com/Solubility_of_Silver_Chloride.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.saltlakemetals.com/Solubility_of_Silver_Chloride.htm" rel="nofollow">http://www.saltlakemetals.com/Solubility_of_Silver_Chloride.htm</a>[/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