Of the large cents in my album, these two are the ones that have an "off" color. They are otherwise problem free, but I would like some input on the toning. The 44/81 has more of a rainbow look to it while the 53 has more of a uniform blue/green hue to it. I am not entirely certain this indicates both were improperly cleaned at some point, or this just happened over time when exposed to various elements. Any thoughts on the matter would be most welcome!
Just looks like corrosion to me. Clean with xylol or acetone then put a light coating of oil on them. The proper method to do this can be googled quite easily.
Also I follow the ways of restoring copper as suggested by the EAC, the copper pros so to speak, and they always suggest putting a light coating of oil on copper after you have properly cleaned your coin.
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