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What causes copper coins to become black and Porous
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<p>[QUOTE="johnmilton, post: 7436447, member: 101855"]That 1826 cent may have been dug and conserved. Remember that where you see porosity is a place where metal has been lost. </p><p><br /></p><p>Copper toning can turn black as well as several shades of brown. It all depends upon the atmosphere where the coin has been stored. </p><p><br /></p><p>To me brown is the best. Given proper storage, away from moisture and up and down changes in temperature, the coin will hold up quite nicely. Copper coins that have had their protective patina stripped are potential trouble, sometimes big trouble. The "virgin" metal can react in many ways, and a lot of those ways are not good. </p><p><br /></p><p>Copper experts are good at retoning such coins and in that way preserving them, but that's beyond my expertise. </p><p><br /></p><p>This 1806, Small 6 Stems, half cent has been re-colored. This piece has a long history. It dates from the 1880s when it was the discovery piece for this very scarce die variety. It was viewed as the finest known for the variety for many years. Sometime, probably in the 1970s, an idiot stripped it. It has been re-colored, but a fair amount of the value was lost. I sold this piece about 20 years ago. </p><p><br /></p><p>[ATTACH=full]1290493[/ATTACH][/QUOTE]</p><p><br /></p>
[QUOTE="johnmilton, post: 7436447, member: 101855"]That 1826 cent may have been dug and conserved. Remember that where you see porosity is a place where metal has been lost. Copper toning can turn black as well as several shades of brown. It all depends upon the atmosphere where the coin has been stored. To me brown is the best. Given proper storage, away from moisture and up and down changes in temperature, the coin will hold up quite nicely. Copper coins that have had their protective patina stripped are potential trouble, sometimes big trouble. The "virgin" metal can react in many ways, and a lot of those ways are not good. Copper experts are good at retoning such coins and in that way preserving them, but that's beyond my expertise. This 1806, Small 6 Stems, half cent has been re-colored. This piece has a long history. It dates from the 1880s when it was the discovery piece for this very scarce die variety. It was viewed as the finest known for the variety for many years. Sometime, probably in the 1970s, an idiot stripped it. It has been re-colored, but a fair amount of the value was lost. I sold this piece about 20 years ago. [ATTACH=full]1290493[/ATTACH][/QUOTE]
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