On Thu, 27 Oct 2005 19:41:53 -0700, "Bob Flaminio"
wrote:

Bob and Dee wrote:
Can anyone tell me how to tell the difference between Zinc and
Copper pennies?

The only way to tell is by weight. The copper weighs about 3.11 grams
and the zinc weighs about 2.5 grams. You need a very sensitive scale
to measure these.

Not at all -- you can do it with a pencil and a popsicle stick.

They also make different sounds when dropped on a hard surface.