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<p>[QUOTE=&quot;GDJMSP, post: 1804443, member: 112&quot;]Sorry Chris, but that is not true. Yes, that hard green patina will protect a coin - once it gets hard. But before it ever got hard it most certainly was verdigris. And before it ever got hard it was damaging the coin. And yes that hard green patina may well be chemically different than verdigris - again once it gets hard. But before it ever got hard it was not, it was the same because that is what verdigris is and what it does.</p><p><br /></p><p>Verdigris changes once you remove or stop introducing moisture. Stop the moisture and the green powdery substance will disappear leaving behind a green patina. If there was enough verdigris there, meaning if it was thick enough before the moisture was stopped, then it will turn into that hard green patina you are talking about. But thick or thin it is still the remnants of verdigris. And it only becomes hard with time, usually a lot of it. Or it occurs sequentially, and builds up in layers, due to the introduction of moisture that stops after a time, and then starts all over again. That is why this hard green patina is so often seen on ancients.</p><p><br /></p><p>Yes, it can happen on more modern coins as well, but it happens in exactly the same way.</p><p><br /></p><p>Now green toning on a coin is an entirely different thing, it is not caused by verdgris. It is merely the color of toning that happens to be visible due to its wavelength.[/QUOTE]</p><p><br /></p>

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