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Message:: [QUOTE="GDJMSP, post: 2855254, member: 112"]Well yeah kinda but not exactly. The thing is this, I am the one who first posted about that study because I am the one who took the time to research it and find it. However, for years prior to my finding that study I had been posting about acetone sometimes causing copper coins to turn weird colors. I knew this from personal observation - meaning I saw it happen with my own eyes. And, there were numerous other reports from knowledgeable collectors of the very same thing happening being posted about on numerous coin forum for over 15 years. And not a one of those people knew anything about that study. So no, that study is not the sole source of the information that acetone can cause copper to turn weird colors. But yes, it is the only scientific study on the subject that I have ever been able to find. But even that doesn't mean it's the only one there is. There may very well be several others out there that were simply not published on the internet. People seem to forget that even though the internet has a wealth of information available, there is still several times that amount of information that is not available on the internet.[/QUOTE]