>Isn't this illegal?
Yup, so is putting them on train tracks:) But that never stopped me...
>
>"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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