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What is a "Sintered Planchet"?

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I saw a coin in a coin holder with "Sintered Planchet" on the label. Does anyone know what a sintered planchet is??? confused.gif

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Your welcome BankNote1!


I am not really into errors but have seen some sintered planchet errors on both nickels and quarters at coin shows.


They sort of look like the coin was struck on a copper planchet, but it's really just copper dust that attached itself to the outside of the planchet during the annealing process.




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Here is a little article on it (about a third of the way down the page). They are also explain "Copper Wash":




and here is a coin of mine which I found in change and that I have been told is probably one (albeit minor):



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