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Philip II of Macedon Double Checking
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<p>[QUOTE="Pavlos, post: 7461408, member: 96635"]I explained it here just now as well: <a href="https://www.cointalk.com/threads/what-is-the-cause-of-this-texture.355448/#post-7461229" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/what-is-the-cause-of-this-texture.355448/#post-7461229">https://www.cointalk.com/threads/what-is-the-cause-of-this-texture.355448/#post-7461229</a></p><p><br /></p><p>Crystallization stays an odd term but I guess it is normal in the coin world. </p><p>Atoms at the boundaries of crystalline grains and bounderies will be in locally higher energy states. It is not just impurities such as copper, silver atoms at the grain bounderies can also easily react forming silveroxide and salts such as silverchloride, revealing the grain boundaries after diffusion or cleaning. Even relatively corrosive-resistant metals can have intergranular corrosion.</p><p><br /></p><p>Pretty Rhodian coin by the way.[/QUOTE]</p><p><br /></p>
[QUOTE="Pavlos, post: 7461408, member: 96635"]I explained it here just now as well: [URL]https://www.cointalk.com/threads/what-is-the-cause-of-this-texture.355448/#post-7461229[/URL] Crystallization stays an odd term but I guess it is normal in the coin world. Atoms at the boundaries of crystalline grains and bounderies will be in locally higher energy states. It is not just impurities such as copper, silver atoms at the grain bounderies can also easily react forming silveroxide and salts such as silverchloride, revealing the grain boundaries after diffusion or cleaning. Even relatively corrosive-resistant metals can have intergranular corrosion. Pretty Rhodian coin by the way.[/QUOTE]
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