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B.D. Treatment leaves coin worse off.
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<p>[QUOTE="Silverlock, post: 3922090, member: 98181"]Generally speaking, copper oxides like cuprite (red patina minerals) won’t naturally form on copper carbonates like malachite (green patina minerals). It’s usually the other way around. </p><p><br /></p><p>Given how easily it dissolved in a dilute base solution, I question whether the red layer was natural. Fragile surfaces like that don’t survive long in the ground. By exposing the green, you may have recovered the natural patina.[/QUOTE]</p><p><br /></p>
[QUOTE="Silverlock, post: 3922090, member: 98181"]Generally speaking, copper oxides like cuprite (red patina minerals) won’t naturally form on copper carbonates like malachite (green patina minerals). It’s usually the other way around. Given how easily it dissolved in a dilute base solution, I question whether the red layer was natural. Fragile surfaces like that don’t survive long in the ground. By exposing the green, you may have recovered the natural patina.[/QUOTE]
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B.D. Treatment leaves coin worse off.
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