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<p>[QUOTE=&quot;Michael H Webb, post: 3750755, member: 93313&quot;]Greetings!</p><p><br /></p><p>I have a number of coins sent from Haifa, Israel that may have exposed to alkaline aerosols or condensate. See <a href="https://link.springer.com/article/10.1007/BF00479411" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://link.springer.com/article/10.1007/BF00479411" rel="nofollow">https://link.springer.com/article/10.1007/BF00479411</a></p><p><br /></p><p><img src="https://i.imgur.com/IAZtVia.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><img src="https://i.imgur.com/VgNWQLg.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><img src="https://i.imgur.com/kTzVkLc.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> <img src="https://i.imgur.com/a5mLiA8.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>These silver proof coins have varying degrees of what appears to be a white corrosion layer chemically bonded with the surface, so that the surface is still mirrored and reflective. However, the white corrosion does not photograph well at most angles. The &quot;white&quot; corrosion might be yellowish were it not for the mirrored silver surface.</p><p><br /></p><p>I accept responsibility for the first coin, so rising it with isopropanol and briefly bathing in in an utrasound for 10 seconds seemed appropriate with no detectable difference in appearance.</p><p><br /></p><p>Could the corrosion be silver carbonate?</p><p><br /></p><p>Any other suggestions?</p><p><br /></p><p>Thank you in advance![/QUOTE]</p><p><br /></p>

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