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Step 3: Help the Copper Dissolve

Since we are using weak and diluted acids, copper will not easily dissolve by itself. We can promote its dissociation by applying voltage across the terminals.

Connect you power supply the positive to the positive clip and the negative to the negative clip. Make sure the two pennies are not touching, you should be able to notice bubbles forming on both pennies. (There should be more bubbles on the negative, fully submerged end).

Wait an hour or two. You can move onto the next step when the acid develops a green tint.

This is a great time to clean your job with soap or toothpaste. This gets rid of dirt and oil that will cause the plating to flake or rub off. (Don't touch your job with bare hands after it has been cleaned. Oh you can also use rubbing alcohol.)
is there a way I could remove all the copper off of the penny, I just want the zinc.
<p>Zinc has a lower melting point than copper. If you just want to extract the zinc, you could melt the penny in a small expendable pan (a gas range should be sufficient). I probably killed many brain cells as a kid doing this with lead tire balances (free metal for my D&amp;D figure molds).</p>
do the first steps with the pennies for a really long time and the pennies should be copper free. Also I really like your sausage
<p>Copper wire or tubing might be better. Pennies are not really copper, and different years have different composition. 1983 to present is copper plated zinc.</p>
<p>Pre-83 pennies are still easy to find. It's interesting that the copper in these cents is worth more than the face value of the coins.</p>
<p>Since copper sulfate was readily available from drugstores when I was a kid, I copper plated anything I could experiment on, including the once-silver content coins which were still 'money.' (Now, every coin is a 'slug.')</p><p>I thought it was entertaining to have copper plated dines, quarters and half-dollars. </p><p>Also, although I havenot done any human 'trials' on babies, I have read and heard that a modern US penny can be fatal to a baby if swallowed. </p><p>The stomach acid breaks down the thin copper coating, and once the zinc core is exposed, the two metals will interact causing the creation of gas that will cause bloating and worst case, death. </p>
<p>nicely written up</p>
can i do gold or silver plating using simillar and untill green tint come we does not let the nickel to solution am i right

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