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<p>[QUOTE=&quot;GDJMSP, post: 2548402, member: 112&quot;]Do you notice what all 4 of you are saying ? Now I ask you, is that the world we, ordinary people, live in ?</p><p><br /></p><p>Or is this the world that we, ordinary people, live in ?</p><p><br /></p><p><br /></p><p><br /></p><p>Every hardware store, every paint store, every home improvement store - painter&#039;s grade acetone is what they sell. It is also the grade of acetone, the type of acetone, that 99.9% of collectors actually use on their coins. Because that is the only thing they can buy.</p><p><br /></p><p>Now I have no idea if what calcol says in his quote above is truly accurate or not, but let&#039;s assume it is. Let&#039;s also assume that this is what Thad refers to when he says &quot;bad acetone&quot; is the culprit.</p><p><br /></p><p>So I&#039;m asking you guys, all 4 of you - is it true ? Does <u>painters grade acetone</u> have impurities in it ? Is what coin collectors buy and actually use on their coins &quot;bad acetone&quot; ?</p><p><br /></p><p>Now I don&#039;t know if it is true, you guys are the chemists, 2 of you are anyway, not me, so you tell me. But here&#039;s what I&#039;ll tell you, it&#039;s really the only thing that matters because painter&#039;s grade acetone is what collectors use. That&#039;s the real world, the world we, ordinary people, live in. It&#039;s not the world inside a lab, or at a professional conservation service. So when we start talking about what acetone will and will not do you have to leave the lab and move into the real world where the rest of us are. You have to use the same acetone that we use. </p><p><br /></p><p>And then, maybe you&#039;ll see some of the same results that we, or at least some of us, see.</p><p><br /></p><p>As for the drying issue in regard to acetone, I&#039;ve discussed that many times before but everybody seems to either ignore the obvious or forget it. Yes, acetone will remove all traces of moisture of from a coin. But then you need to ask the question that really matters- for how long will it do this ? Answer, it will remove moisture from the coin for a couple of hours at the most.</p><p><br /></p><p>After that couple of hours has passed, the coin will revert right back to exactly the same state as the coin would be in if you had rinsed it in distilled water and then let it dry. That is an undeniable fact. How and why does this happen ? It&#039;s very simple, it is due to the ambient humidity in the air. </p><p><br /></p><p>You guys are the scientists, so let me give you some science to test. Take 2 coins, rinse one in distilled water and let it dry overnight, using my method of standing the coin on edge. Take coin #2 and rinse in acetone to remove all moisture from it. In a couple of minutes at most all the acetone will be gone and the coin will be as dry as it can be.</p><p><br /></p><p>Now let both coins sit there in the air for 2 hours, side by side. After that 2 hours measure, if you can, the moisture on the surface of the coin. I can guarantee you that the moisture on the surface of both coins is going to be exactly the same because of the ambient humidity in the air.</p><p><br /></p><p>The point of all this is that the drying factor of acetone is meaningless because whether you rinse a coin in acetone or not that moisture on the surface of that coin is going to return to being whatever ambient humidity happens to be. And no, putting the coin in a coin holder and then into a safe or a storage container isn&#039;t going to change anything because no coin holder is airtight. Both coins, the one rinsed in distilled water and the one rinsed in acetone will be exactly the same in regard to moisture on the coin. This is inevitable.[/QUOTE]</p><p><br /></p>

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