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<p>[QUOTE=&quot;Insider, post: 2547856, member: 24314&quot;]GDJMSP posted: &quot;Must ?&quot; <span style="color: #00b300">Yes, must if you wish to do a professional job. &quot;</span>I sure never have&quot; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" /> <span style="color: #00b300">That&#039;s because neither of us are professional conservators!</span> &quot;, and I&#039;ve used it plenty of times. In fact I strongly advise against using soap on a coin at all because soap is one of the hardest things there is to get all the residue off a coin.&quot; <span style="color: #00b300">Actually, the deionized water used by professionals works very well.&nbsp; Hot distilled water does also.&nbsp; </span>&quot;Yeah, it can be done, but some other chemical is required.&quot; </p><p><br /></p><p>&quot;Yes, of course it can. And yes you have to dip it again.&quot; <span style="color: #00b359">I disagree.</span> &quot;But dipping copper is special, not easy.&quot; <span style="color: #00b359">And it is not done with the stuff we all have heard of.&nbsp; Unfortunately, the guys who do it at NCS have signed confidentially agreements <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /> so their lips are sealed. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie12" alt="o_O" unselectable="on" unselectable="on" /> </span>The evidence, namely the mere existence of so very, very, many Red coins clearly indicates that it can be done. But it aint easy ! And no, I will absolutely not explain how.&quot; <span style="color: #00b359">See! <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie57" alt=":jawdrop:" unselectable="on" unselectable="on" /> I always suspected Doug wrote the instruction book for the first conservation service!&nbsp; </span>[/QUOTE]</p><p><br /></p>

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