Isn't this illegal?
"Timothy A. Seufert" wrote:
> (In my high school chemistry class we did a cool "experiment" where we took
> a shiny new penny, scraped an edge to expose some of the zinc, and then
> dropped it in a weak HCl solution. HCl reacts with zinc, but not copper.
> In a day or so the HCl had completely eaten the zinc out of the penny,
> leaving a copper shell.
>
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