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<p>[QUOTE=&quot;Kentucky, post: 2386623, member: 33176&quot;]Actually an experiment I have done many times in lab (actually the students do it and I just get to lounge around) is to heat a copper wire in a Bunsen burner flame until it is coated with a black copper oxide coat.&nbsp; Still hot, the wire is lowered into a test tube that has some methyl alcohol in it.&nbsp; The vapors of the methyl alcohol react with the copper oxide to make formaldehyde (which we tell the students to have a whiff of) and the copper gets super shiny...now, how can I do this with a coin? </p><p><br /></p><p>Another thought, a common (not really, but what else) reducing agent is oxalic acid.&nbsp; This used to be the stuff you would use to clean radiators.&nbsp; Put a solution in, run it awhile and then drain it.&nbsp; The oxalic acid reacts with the iron rust in the radiator to make iron (usually as a powder that flushes out) and carbon dioxide.&nbsp; I have dabbled in some experiments with the oxalic acid but haven&#039;t had too much success.[/QUOTE]</p><p><br /></p>

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