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<p>[QUOTE=&quot;Insider, post: 2781793, member: 24314&quot;]imrich, posted:&nbsp; &quot;In my long term learning process where I&#039;ve ruined some expensive coins, I&#039;ve been amazed at how sensitive the surface of a &quot;90%&quot; Silver or Gold coin is to abrasion. I&#039;ve seen the visual damage that a &quot;Q-tip&quot; cotton swab can do when lightly applying same to the surface of a coin in &quot;cleaning&quot; fluid.&quot;</p><p><br /></p><p><span style="color: rgb(89, 0, 179)">100% true!&nbsp; Watch out</span>.</p><p><br /></p><p>imrich, continued: &quot;I personally would not recommend using anything other than <b>lubricated fingers</b> on a precious coin.&quot;</p><p><br /></p><p><span style="color: rgb(89, 0, 179)"><b>Not</b> advisable.&nbsp; Don&#039;t take my word for this as the poster claims success.&nbsp; Try it out for yourself.</span></p><p><br /></p><p>&quot;Never anything intended/designed for &quot;scrubbing&quot;. Cleaning coins is a difficult process, where I&#039;ve learned that after a proper soaking, only a spray of proper filtered &quot;solvent&quot; is recommended for application under pressure through a minute orifice. Ultrasonic cleaning processes can have wonderful non-damaging results when using proper equipment/technique.</p><p><br /></p><p><span style="color: rgb(89, 0, 179)">From what I&#039;ve seen, the proper use of an ultrasonic cleaner + chemicals is often used.</span> </p><p><br /></p><p><br /></p><p>V. Kurt Bellman, asks: So why doesn&#039;t the hobby use the term &quot;mechanically cleaned&quot; or &quot;abrasively cleaned?</p><p><br /></p><p><span style="color: rgb(89, 0, 179)">Possibly to save space on the label?&nbsp; Many cleanings are done with the abrasive use of chemicals! </span> <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie57" alt=":jawdrop:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /></p><p><br /></p><p>Johndoe2000$, asked: &quot;Should a cleaning scale be developed?&quot;</p><p><br /></p><p><span style="color: rgb(89, 0, 179)"><i><b>An adjectival scale to describe cleaning has existed for over forty years in the old &quot;Technical Grading System.&quot;</b></i>&nbsp; Unfortunately, the lines between each part of the scale have never (IMO they can never) been fixed as there are too many variables so it is subjective.<b><span style="color: #ff8000">***</span></b> Besides, Technical Grading is only a classroom exercise with no association to the coin market.&nbsp; </span></p><p><span style="color: rgb(89, 0, 179)"><br /></span></p><p><span style="color: rgb(89, 0, 179)"><b><span style="color: #ff8000">***</span></b>Example: When does a lightly hairlined coin due to cleaning become a harshly hairlined coin.&nbsp; When does the &quot;mechanical cleaning&quot; become buffing or polishing?&nbsp; The TPGS have &quot;solved&quot; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie12" alt="o_O" unselectable="on" unselectable="on" /> <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /> this problem by calling almost everything <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie5" alt=":confused:" unselectable="on" unselectable="on" /> they <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie30" alt=":bucktooth:" unselectable="on" unselectable="on" /> see - <b><span style="color: rgb(255, 0, 0)">Cleaned</span></b>.&nbsp; IMO, that&#039;s too <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie98" alt=":wacky:" unselectable="on" unselectable="on" /> bad. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /> </span></p><p><span style="color: rgb(89, 0, 179)"><br /></span></p><p><span style="color: rgb(89, 0, 179)">For now, collectors need to develop their own &quot;scale.&quot;</span>[/QUOTE]</p><p><br /></p>

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