I found it they will be copper coated zinc hear is the article ((To test the viability of six different alloys under consideration, the Mint inside its lab here is making millions of what it calls "nonsense" pieces. The lab recently was minting about 2 million test nickels made of copper-plated zinc in one of its stamping machines. The pieces, with a profile of Martha Washington on the front, remain the same size and shape as current nickels, but weigh in at 4.06 grams, a little less than the current coin's 5 grams, and are the same brownish color as a penny.
The Mint has no plans to circulate a Martha Washington nickel. Only about 1,000 of the copper-zinc pieces were retained for additional research that mimics the wear and tear of steady handling. That includes exposure to artificial perspiration and extreme humidity. Coins are designed to hold up for about 30 years.
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"So far the results are good for the majority of the materials," said Uvon Tolbert, a process engineer at the Mint who is running many of the tests.
The Mint also is weighing public perception, ease of production, durability and costs to industries that might have to alter coin-reading machinery. "If we do offer a new nickel, how is the public going to respond to perhaps a brown nickel?" Mr. Peterson asked.
As for the penny, Mr. Peterson said stopping production is a "discussion topic." Canada, the U.K. and other nations have stopped production of their smallest-denomination coin. While some economists and other groups see the penny as a waste, Mr. Peterson says demand for the one-cent piece remains high. The Federal Reserve