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Message:: [QUOTE="GDJMSP, post: 3254894, member: 112"]Jim I don't dispute a single thing you're saying about the article - not one. But consider this, the article found that under a certain set of conditions acetone would react in a negative way with copper. That alone raises the possibility that there may be other certain sets of conditions where acetone may also react with copper in a negative way. And one of those could easily be - if there was something else, some other material or traces of some other chemical, on the coin prior to the use of acetone on the coin. And then, if and when acetone was used that's when the reaction would occur. But if that other material or chemical were not on the coin - then no reaction would occur when acetone was used. A scenario like that occurring would be a very plausible explanation for why the adverse color reaction occurs sometimes, and not others. My point is and always has been - in the end it doesn't matter how or why it happens. It doesn't matter what exactly is causing it. It only matters that it happens sometimes ! And my point has also always been that any risk of a reaction possibly occurring can easily be avoided simply by using xylene on copper instead of acetone. In almost every case it will do the same things that acetone will do, safely remove the same things that acetone will remove. And with no risk of a possible adverse color reaction. (Or at the least not one that I have ever seen or ever heard of. BUT - there may well be one out there somewhere.) Now I don't know about you but it seems like a no brainer to me. But to simply say that it cannot happen, that no matter what it cannot happen, when other reasonable people report that it does sometimes - is that even a good idea ?[/QUOTE]

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