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<p>[QUOTE=&quot;robinjojo, post: 6601269, member: 110226&quot;]That&#039;s true, the embrittlement is a combination of oxidation and the leaching of copper alloy, leaving a dark, brittle crystalline surface that over time becomes increasingly thicker, until the entire coin is altered.&nbsp; </p><p><br /></p><p>Now I have a tetradrachm that had very heavy oxidation that did penetrate fairly deeply, much to my dismay when I attempted to remove some of, only to see a lot of the detail melt away.[/QUOTE]</p><p><br /></p>

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