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<p>[QUOTE=&quot;Insider, post: 2487543, member: 24314&quot;]This is going to be fun...<span style="color: #ff00ff">GAME ON</span>: [USER=19165]@physics-fan3.14[/USER] posted the following, my humble opinions in color:&nbsp; <span style="color: #b30000">NOTE</span>: <span style="color: #000000">Mr Poe is an authority on coin grading and has written a very good book - <i>The Art and Science of Grading Coins</i> that I highly recommend for beginners.</span></p><p><br /></p><p>In widely accepted numismatic parlance, &quot;skin&quot; refers to toning or patina, which are natural reactions of the coin with its environment. The compounds formed are oxides or sulfides of the coin metal. <span style="color: #ff00ff">I believe that&#039;s basically what I said so I&#039;ll basically agree.&nbsp; </span></p><p><br /></p><p>Acetone WILL NOT remove these. Acetone WILL NOT affect toning, if it is natural. <span style="color: #ff00ff">Actually, acetone WILL lighten some forms of &quot;toning&quot; color on coins. </span>Acetone will only remove organic compounds (<span style="color: #ff00ff">Which ADD &quot;color&quot; to coins</span>)&nbsp; Acetone WILL NOT affect metal comounds. <span style="color: #ff00ff">I never said it did; but it&#039;s good to let others reading this know.</span></p><p><br /></p><p><br /></p><p>I&#039;m not sure where you got this from. Do you have a reference explaining this? I, and many others I know, have used &quot;skin&quot; to refer to any natural patina on the coin. <span style="color: #ff00ff">Actually &quot;Skin&quot; was defined for me by two different top two TPGS finalizers and one top two TPGS owner so your &quot;beef&quot; is with them.&nbsp; I regard their opinions and definitions over yours.&nbsp; However, in my first paragraph I explained we are both probably saying the same thing.</span></p><p><br /></p><p>There is absolutely no need to treat the coin with kid gloves. <span style="color: #ff00ff">Easy to say when you don&#039;t own it.&nbsp; Imagine if the TPGS&#039;s treated our coins roughly. </span>Put the entire coin in a glass of acetone, and leave it there. Remove all of the organic compounds from the surface to help in conserving the coin. If the toning, or any other colors were removed then they were not natural toning and shouldn&#039;t have been there in the first place.&nbsp; <span style="color: #ff00ff">I&#039;ll agree and if you don&#039;t like the &quot;raw&quot; color of you coin after its &quot;bath&quot; keep your thoughts to yourself as you were warned.&nbsp;&nbsp; </span></p><p><br /></p><p>I don&#039;t understand why this would be the case. Natural toning on gold is a compound of silver and copper sulfides - and should be unaffected by acetone. If the color changed by application of acetone, then the compounds on the surface were organic in nature, <span style="color: #ff00ff">BINGO! News Flash. The elevator is working - and that is EXACTLY how &quot;skin&quot; gets lightened - thank you very much, bow and exit stage right. </span>and shouldn&#039;t have been there in the first place. Do you have pictures, or some sort of explanation for this claim?&nbsp; <span style="color: #ff00ff">I&#039;m truly sorry I don&#039;t but the next time I play with a $20 Saint with &quot;skin&quot; that I OWN, I&#039;ll make one for you that you can put in the 2nd Edition of your book.&nbsp; </span></p><p><br /></p><p>Water will not chemically affect the surface of the coin (unless there are solvents present) <span style="color: #ff00ff">Like those in tap water and sea water (adding salt water here is not playing fair - I&#039;m making some bad humor<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />). </span>If water affects the coin, the substance shouldn&#039;t have been there in the first place. There is a big difference between natural oxidation, and reaction between sulfur compounds in the environment, and surface contamination from foreign materials. <span style="color: #ff00ff">Well said, I agree.</span></p><p><br /></p><p>There is a huge difference between conservation and doctoring. The semantics are beyond the discussion of this post (although other posts have dissected the issue). True conservation seeks to stabilize the coin and remove damaging substances. If a surface is impaired after conservation, it was because the contaminants had damaged the coin already. <span style="color: #ff00ff">OR the conservation &quot;Ex-Pert&quot; screwed up or the coin just &quot;blew up.&quot; Bad things happen to good coins <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" /> </span>Doctoring, however, seeks to alter the surface of the coin to improve the apparent appearance of the coin.&nbsp; <span style="color: #ff00ff">And conservation ALSO &quot;seeks to alter the surface of a coin in order to improve the apparent (?) appearance of the coin.</span></p><p><br /></p><p>Dipping is doctoring. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie57" alt=":jawdrop:" unselectable="on" unselectable="on" /> <span style="color: #ff00ff">NEWS FLASH for all you &quot;purists&quot; at least 90% of conservation involves some form of chemical treatment (DIPPING).&nbsp; </span>Dipping removes metallic compounds from the surface of the coin. Sometimes, a silver solute is required to remove the compounds (and, a properly performed dip is still considered market accepable). However, dipping is doctoring. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie15" alt=":arghh:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie20" alt=":banghead:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie20" alt=":banghead:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie20" alt=":banghead:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie57" alt=":jawdrop:" unselectable="on" unselectable="on" /> <span style="color: #ff00ff">Answered above</span>.Acetone does not change the metallic structure of the surface of the coin, and thus is not considered doctoring - it can only remove organic compounds. <span style="color: #ff00ff">I&#039;ll go with that in theory; but BOTH acetone and other chemical treatments remove something if it is there. Often when this is done the coin lightens.</span></p><p><br /></p><p>Without closer examination, I&#039;m not sure what caused the mark. <span style="color: #ff00ff">Well, one rookie (me) and one or two other advanced numismatists are: It&#039;s called &quot;slag&quot; and it produced a flaw on the coin that acetone should have no effect on.&nbsp; </span>If it is a planchet flaw, then acetone won&#039;t remove it (of course). However, treating the entire coin in acetone will cause no adverse effects to the coin (if properly done), and will raise absolutely zero alarms.[/QUOTE]&nbsp; <span style="color: #ff00ff">So go for it.&nbsp; If you are lucky, you will just &quot;strip&quot; the coin.&nbsp; If you mess up, you&#039;ll just hairline it. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /></span>[/QUOTE]</p><p><br /></p>

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