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Message:: [QUOTE="V. Kurt Bellman, post: 2386452, member: 71723"]Might be that nasty zinc in the mixture, plus not every toned area on a cent is caused by oxidation. So we have mostly copper that is mostly oxidized, and we get mostly what we might expect. I fully suspect that a browned, yet having full luster under it cent will yield the best result. In such a case, I doubt serious heating will be necessary. A lustrous but browned cent will likely begin to redden with only moderate heating in an H2 rich environment. Beware: H2 and O2 in a "lazy" mixture can be dangerous. See: Hindenburg, Lakehurst, NJ. Oh the humanity! For my experiments using methane, I keep loose woven burlap bags on hand to tie to the posteriors of neighborhood cows. Just add grasses. Voila! Methane and hydrogen sulfide.[/QUOTE]