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What causes copper coins to become black and Porous
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<p>[QUOTE="Paul Chouan, post: 7466427, member: 93775"]I used to own some copper ancients that turned black, perhaps centuries ago, and I got rid of them all - I couldn't stand peering at them under strong lights to make out what was on them. If I were to start buying ancients again, I would probably go exclusively for light-to-bright green patinas, or "circulation cameos" with dark fields and light devices. Earthen (orange or yellow) patinas are attractive too, but notoriously easy to fake.[/QUOTE]</p><p><br /></p>
[QUOTE="Paul Chouan, post: 7466427, member: 93775"]I used to own some copper ancients that turned black, perhaps centuries ago, and I got rid of them all - I couldn't stand peering at them under strong lights to make out what was on them. If I were to start buying ancients again, I would probably go exclusively for light-to-bright green patinas, or "circulation cameos" with dark fields and light devices. Earthen (orange or yellow) patinas are attractive too, but notoriously easy to fake.[/QUOTE]
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