Brass - Aich's brass contains 66.6% copper and 36.58% zinc, the balance tin and iron.
Muntz brass contains 60% copper and 40% zinc with a trace of iron and is used as a lining on boats
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.....1 cent. It is in common circulation and is made out of copper-plated zinc. It isn't worth anything more than face value.
It depends what you are asking. Assuming that you are referring to US One Cent Coins:the face value is US$25.00the metal value of the copper in pre-1982 coins is US$67.35 (as of June 8, 2011), although it is illegal to melt them down for copperthe metal value of the zinc in post-1982 coins is US$15.15 (as of June 8, 2011)the numismatic value depend on the year, mintmark, and condition of each coin
It's probably only worth face value, except as a conversation piece / curiosity. All US pennies since 1983 are made almost entirely of zinc, covered with a thin coating of copper. If the coating was never applied at the mint, or someone dipped the coin in acid the silver-colored zinc core will become visible. No circulating US coins have contained any silver since 1969, and pennies were never made of silver because they would have been worth more than dimes.
There's no such thing as a "white penny". Cents are made of zinc and plated with copper. You have either a cent ... - that's been plated a second time for use in jewelry or similar. Value, 1 cent. - that's been dipped in acid to remove the plating. Again, 1 cent. - that was accidentally missed during the plating phase. That's a real mint error and is worth $75 or so, but you'd need to have the coin evaluated in person by a dealer or appraiser who is familiar with error coins.
The coin is zinc coated steel, not silver, that's why it's magnetic. 1943 steel Lincoln cents are common. Most circulated coins have retail values of 5 to 10 cents.