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<p>[QUOTE=&quot;V. Kurt Bellman, post: 2113652, member: 71723&quot;]Not that this is one, I don&#039;t think it is, but another technique was to put bronze cents in well used photographic fixer in a photo lab. Red bronze cents would plate with silver in an extremely short time. The longer it was in, the heavier the plating. It was possible to take this too far. If the cent was in too long, and the fixing solution had enough silver in it, the whole thing would resemble something crusted over after decades under the sea, except the crust was nearly pure crystalline silver.</p><p><br /></p><p>This was classic ion exchange. The copper ions had an even higher affinity for the thiosulfate ions than the silver ions did.[/QUOTE]</p><p><br /></p>

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