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<p>[QUOTE=&quot;SuperDave, post: 2782850, member: 1892&quot;]An answer to that is out of my competence. Although there are those who swear by MS70, I don&#039;t touch the stuff and have no experience to offer. Some have had success using thiourea to remove it, others not so much.</p><p><br /></p><p>Keep in mind, the prevailing theory about the formation of this stuff is, incomplete rinsing during planchet preparation is then &quot;baked on&quot; to the planchet by the annealing step in the process. Something which has been &quot;attached&quot; to the coin in thousand-degree temperatures isn&#039;t going to be easy to remove....I suspect that repeating the annealing step as part of the removal process might be of benefit, but I don&#039;t know many collectors who are capable of reliably heating their coins into the 1k temperature range, much less then performing chemical reductions and/or cleaning processes upon them. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Another thing to keep in mind is most of these coins are intended by their manufacturer to be <b>bullion</b>. Lumps of silver purchased only for their precious metal value, and the quality of the coin&#039;s surfaces are irrelevant. It is we, the collecting public, who have artificially assigned greater value to them via the TPG system. </p><p><br /></p><p>Of course, the milkspotting problem also plagues issues actually intended as &quot;collectible,&quot; and shame upon the various Mints (Canadian issues have even greater milkspotting problems than US Mint ones) for not altering their techniques to compensate. I, for one, would trade a greater sensitivity to silver sulfide toning down the road for the removal of the milkspotting problem.</p><p><br /></p><p>But as it is, ASE&#039;s are a crapshoot. The milk spots might appear early, they might take years, they might be removable but might not. You pays your money and takes your chances.[/QUOTE]</p><p><br /></p>

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