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To: TimF who wrote (66915)	1/3/2002 8:55:38 AM
From: semiconeng	Respond to of 275872

What would make that particularly interesting is the fact that a penny is only 2.5% copper. They are mostly zinc. Maybe it was an old penny. Tim Don't know. It's the story they tell in the Cu Contamination Class. Could have been a BS story for all I know. It got the point across..... :-) Semi

To: TimF who wrote (66915)	1/3/2002 2:43:35 PM
From: ptanner	Read Replies (1) \| Respond to of 275872

Tim, re: "What would make that particularly interesting is the fact that a penny is only 2.5% copper. They are mostly zinc. Maybe it was an old penny." Rip a "new" penny in half and you will see that the copper is all on the outside and the zinc on the inside. I did this when the new pennies came out and it was interesting to see all the shiny zinc and a thin copper cladding on the outside. This change saved the mint a lot of money as zinc was considerably less expensive than copper at the time (and may still be). -PT