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Re: [APD] Zinc plant weights

Nick Andrews wrote:
> Zinc is pretty soft.  Have you never taken apart an old non-alkaline battery and cut the casing open?  They are made of zinc.  The carbon rods are also useful for  'experiments' as well.

Just like any pennies made in 1983 or after - they bend easily compared 
with pre-1983 pennies. You can also scratch off a tiny section of the 
copper plating on the side, throw the penny into some hydrochloric acid, 
and enjoy the results. The acid eats the zinc out of the copper plating 
shell and leaves you with what amounts to a copper foil embossed penny.
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