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<p>[QUOTE=&quot;sand, post: 7794731, member: 118540&quot;]Hello [USER=76543]@Johndakerftw[/USER]. I&#039;ll just copy and paste, the following information, from one of my previous posts. By the way, I have read, in other posts, that quite often, green patina starts as a flaky light green. Then, over the centuries, the flaky light green turns into a hard dark green. Either that, or it destroys the coin. Perhaps it&#039;s a race. If the flaky light green, becomes coated with hard dark green, soon enough, so that no more oxygen (or something) can reach the underlying copper, then maybe the coin is saved, and the flaky light green becomes hard dark green. But if the flaky light green doesn&#039;t get coated with hard dark green soon enough, then perhaps the flaky light green allows oxygen (or something) to the underlying copper, through the holes in the flaky light green, causing the destruction of the coin.</p><p>Or maybe, sometimes, a coin starts with a flaky light green patina. Then, somehow, the coin becomes deposited in an oxygen-free (or something-free) environment, which causes the flaky light green to become coated with hard dark green.</p><p>Somehow, coins with beautiful, hard, dark green patinas are created. I just don&#039;t know how, at the moment.</p><p>Maybe I&#039;ll Google it, sometime.</p><p>I don&#039;t know, if any of the above, is true, or not.</p><p>Maybe someone, with more knowledge about this subject, will comment.</p><p>Anyway, here is my copied information, from one of my other posts :</p><p>I&#039;m no expert in this type of thing, so take what I say, with a huge grain of salt. I&#039;ve had some success, removing stubborn stuff, by putting a coin under a low powered microscope, and using a sharpened wooden toothpick (try this first), or using a very pointy, very sharp scalpel, to push or scrape the stuff away. However, it is very easy, to accidentally scratch the underlying green patina, exposing bare metal (I have had this happen). So you have to be careful. And you have to be lucky.[/QUOTE]</p><p><br /></p>

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