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Don’t copper alloys tarnish? What about tarnishing?

Despite the fact that CuVerro® surfaces have been formulated for their strong resistance to tarnishing, all uncoated copper alloys are subject to natural oxidation. The effect however will be more comparable to the subtle surface changes typical of copper-nickel coins (such as dimes, nickels and quarters), which over time, shows minimal color change, compared to the more noticeable tarnish that can develop with, for example, a copper penny.