I Have A Cent That Appears To Be Missing The Copper Plating. (2005-D LMC)

BJsCoins1, read through this thread: http://goccf.com/t/460410

If it's truly missing the copper plating, then that's a great find.

Check ebay sold values.
John1

Would be fun to know the weight--accurate to two decimal places.

Is that Solid-State Diffusion, As the penny is heated, copper atoms from the plated layer migrate into the zinc core. Eventually, the copper layer becomes thin enough that it seems to vanish, revealing the underlying zinc.

Diffusion in solid state materials is a process whereby a liquid, a gas, or another solid can mix together with the host solid on the atomic level. For diffusion to occur, there must be a concentration gradient present and the rate of the diffusion process is greatly
affected by an increase in temperature. By using post 1982 pennies which consist of a zinc core and a copper plated shell, the diffusion of copper into zinc can be readily shown. After subjecting the pennies to elevated temperatures for set periods of time, the copper layer 'disappears', leaving behind a zinc colored surface.


Heres the research info https://materialseducation.org/educ...f_Metals.pdf

So Tier 1 support unable to help confirm...contact Mike Diamond Tier 2...please hold and thank you for choosing CCF!

Many years ago, I thin gold plated a .925 fine silver Australian Florin.
Over the decades, the gold and silver atoms inter migrated across the plating interface, and now,
the coin looks to have much paler gold plating than when it was originally plated.
The pennies pictured clearly show this inter migration phenomenon.

You can fool lots of people by applying a thin electro zinc plating over Zincolns.
It is not done often, because it is not worth the effort.