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<p>[QUOTE=&quot;GDJMSP, post: 3442251, member: 112&quot;]Firstly - </p><p><br /></p><p><br /></p><p><br /></p><p>It may take much longer, days or even weeks. It looks like much of what is on the coin is ordinary dirt and grime. And it is not unusual for soaking alone to take a long time to have much effect. Try swishing the coin around a couple times a day while it is soaking. The agitation helps remove what has been loosened in the upper layers of the dirt by the soaking, and allows the lower layers to be penetrated and also removed.</p><p><br /></p><p><br /></p><p><br /></p><p>Here in the US it&#039;s readily available in just about any paint store, as use with paint is its primary purpose to the best of my knowledge. And since it&#039;s not a particularly harmful chemical I cannot imagine it would not also be available in the same places in Germany or other countries for the same reason. But who knows, maybe it isn&#039;t.</p><p><br /></p><p>As for the comments about acetone and copper, I&#039;ve seen it with my own eyes, it does happen. Not often grant you, but it does once in a while. And not just pink, but other colors as well. That said and understood, the odds are in your favor that nothing undesirable will happen if you use acetone on the coin, to get off what it can get off, mainly stuff like the tape residue. But be aware, much of the other issues the coin has, it will not have any effect on them, none. So you will still have to use another method as well to get the desired results.</p><p><br /></p><p>Regarding the Verdi-Care you mentioned, while it will no doubt help with the verdigris, I doubt it will help remove much of anything else. At least it never has for me. And Verdi-Care will also leave a coating on the coins that in my opinion should be removed. Acetone or xylene will do that nicely.</p><p><br /></p><p>The reason olive oil works on coins, and not just copper coins but all of them, is because olive oil is acidic. But it is mildly acidic and it takes a long, long time to work. You may have to soak the coin in it for months to get the desired results.</p><p><br /></p><p>You also need to understand that while using olive oil will not harm the coin per se while it&#039;s in there, it will harm the coin if you do not remove the olive residue from the coin once the soaking is finished. And to remove it you&#039;re going to need to use acetone or xylene. Both of which I always recommend be followed with a final rinse in distilled water, followed by proper dying. </p><p><br /></p><p>As a final word, it is necessary that people understand that when trying to properly clean coins, each method you use, (water, acetone, xylene, olive oil) will only remove some of the contaminants. No single method will remove everything. Properly cleaning coins is a step by step basis and it can tale a long time. And it is equally important that each step be followed in its proper order to get the best results. And no matter what you use, in every case a final rinse in distilled water and proper drying is always my recommendation. And proper drying to me is to stand the coin on edge (leaning up against something), let the excess water run off and then let the dry that way over night. I do not recommend using towels or cloth to dry the coin. Doing so can leave behind lint, (which can cause spotting or toning later) or it can create minor hairlines if and when any movement occurs during the process. Doing it my way - nothing happens.[/QUOTE]</p><p><br /></p>

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