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<p>[QUOTE=&quot;GDJMSP, post: 3607350, member: 112&quot;]Mike I wanna add something else here. You said - </p><p><br /></p><p><br /></p><p><br /></p><p>So what you&#039;re saying is that some copper coins have something on them, and whatever that something is, that&#039;s what is reacting with the MS70 and causing the coins to turn blue. And at the same time, you&#039;re saying, or at the least implying, that not all copper coins turn blue if MS70 is used on them - because they don&#039;t have that &quot;something&quot; on them.</p><p><br /></p><p>Well Mike, when you say that you&#039;ve treated some copper coins with MS70 and they did not turn blue - I believe ya. I don&#039;t doubt your word a bit, I trust ya too much to do that.</p><p><br /></p><p>But, think about this. Perhaps, just perhaps, the reason that some of the copper coins you have treated with MS70 did not turn blue, is specifically because they had &quot;something&quot; on them that prevented them from turning blue. I mean both scenarios are equally likely. If there&#039;s something that can cause the blue, it&#039;s just as likely that something can be preventing it.</p><p><br /></p><p>Also think about the fact that the reason you are using MS70 on the copper coins - IS because there is something on them that you are trying to remove. I mean, the reason you&#039;re using the MS70 to begin with is <b>because there is something there</b>. If there wasn&#039;t anything there you wouldn&#039;t be using it at all. </p><p><br /></p><p>So which scenario seems more likely ?</p><p><br /></p><p>Now consider this. As I said above, I&#039;ve used MS70 on copper coins I took straight out of mint packaging. There was nothing, absolutely nothing that could be seen on the coins, and yet they turned blue - every single one. </p><p><br /></p><p>Now could it be that there was a residue on the coins from when the planchets were washed that was not rinsed off completely - and that residue is what caused the coins to turn blue because it reacted with the MS70 ? Yeah, it could be. I readily admit that. But I will ask again - does that matter ?</p><p><br /></p><p>The whole point is that no matter what, there is a risk, a risk that if MS70 is used on copper coins that those coins will turn blue. </p><p><br /></p><p>However, if you use xylene on the copper coins, it will do every bit as good a job as the MS70 will, if not a better job of it - and there is no risk at all ! None, zero !</p><p><br /></p><p>So which would be the better option ?[/QUOTE]</p><p><br /></p>

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