All US nickels except the famous "war nickels" from WWII are made of 75% copper, but the remaining 25% of the alloy that's nickel is enough to give the coins a silvery color. The only way a nickel could appear copper in color is if it were tarnished, altered by exposure to chemicals, or plated as part of a high-school chemistry experiment (we made lots of them when we studied half-reactions!).
Regardless of the cause, it has no added value I'm afraid.
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The first 5-cent US nickel was made in 1866, the 3-cent nickel in 1865, and the copper-nickel flying eagle 1-cent in 1856.
25 cents. All 1974 quarters were made from copper-nickel.
US quarters didn't contain any nickel until 1965. 1964 and earlier quarters were made of an alloy of 90% silver and 10% copper. Please see "What is the value of a 1941 US quarter?" for more information.
All US half dollars dated 1974 were struck in copper-nickel. They have no added value, so feel free to spend it.
All circulating dimes dated 1965 and later are made of copper-nickel, not silver.
If you have a US nickel, it is either coated with copper or has changed color due to exposure to some chemical and has no special value. If it is a 1942 Canadian nickel, it varies from $.40 to $1.75 in circulated conditions, $3 and up in uncirculated grades. The material is called "tombac" and is an alloy of copper and zinc.
The first 5-cent US nickel was made in 1866, the 3-cent nickel in 1865, and the copper-nickel flying eagle 1-cent in 1856.
All US nickels (except for silver war nickels) are 75% copper and 25% nickel, with a present melt value of 4.9 cents.
A US nickel is silver in color with a slight hint of copper.
25 cents. All 1974 quarters were made from copper-nickel.
No such (US) coin exists because the copper-nickel 3 cent piece was not minted until 1865.
All 2010 US nickels were struck in the standard cupronickel alloy. A nickel that appears to be made of copper could have been discolored by heat or chemical exposure, or it might be copper-plated. The latter is a very common high-school chemistry experiment.
A US quarter is primarily made of nickel and copper. It is composed of approximately 91.67% copper and 8.33% nickel.
The only US coin ever struck in steel was the famous 1943 Lincoln cent, minted when copper was diverted to making ammunition. All buffalo nickels are made of an alloy of 75% copper and 25% nickel. Please see the question "What is the value of a 1927 US nickel?" for more information.
As of September 2021, the metal value in a nickel (which is composed of 75% copper and 25% nickel) is less than its face value. The cost of the metals used in a nickel is lower than 5 cents due to fluctuations in metal prices.
US state quarters are made of a combination of copper-nickel (75% copper, 25% nickel) bonded to a copper core. This composition helps to create a durable coin that is resistant to wear and maintains its appearance for circulation.
Current US dimes are made of a "sandwich" composite consisting of a solid copper core clad in outer layers of an alloy of 25% nickel and 75% copper, for an overall mix of roughly 92% copper and 8% nickel. Until 1964 US dimes, quarters, half dollars and dollars were struck in an alloy of 90% silver and 10% copper. Except during WWII, US nickels have always been made of the same 25% nickel / 75% copper alloy, but they're solid metal rather than clad.