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64 & 67 IHP's thoughts........grade........value
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<p>[QUOTE="KurtS, post: 2111947, member: 11786"]Agreed--my first take was "wood grain", which is caused by improper alloying of the bronze--very common to some years of IHCs.</p><p><br /></p><p>The green spots could be a few things: it could be just a bit of loose dirt that has reacted to copper in the coin, but usually you see these in recesses rather than on top of the portrait. Or, it could be a (stable) bit of verdigris. The worst case scenario would be "bronze disease" or copper chloride, which will continue to eat into the coin. In any case, a short distilled water soak could help and certainly not harm the coin. I would avoid picking at the spots because it would probably reveal discoloration beneath. BadThad knows the chemistry and would have the best advice here.</p><p><br /></p><p>As for grading, I found both tricky to give a definitive grade--the pics are sorta dark.[/QUOTE]</p><p><br /></p>
[QUOTE="KurtS, post: 2111947, member: 11786"]Agreed--my first take was "wood grain", which is caused by improper alloying of the bronze--very common to some years of IHCs. The green spots could be a few things: it could be just a bit of loose dirt that has reacted to copper in the coin, but usually you see these in recesses rather than on top of the portrait. Or, it could be a (stable) bit of verdigris. The worst case scenario would be "bronze disease" or copper chloride, which will continue to eat into the coin. In any case, a short distilled water soak could help and certainly not harm the coin. I would avoid picking at the spots because it would probably reveal discoloration beneath. BadThad knows the chemistry and would have the best advice here. As for grading, I found both tricky to give a definitive grade--the pics are sorta dark.[/QUOTE]
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64 & 67 IHP's thoughts........grade........value
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