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tarnishing (a chemical change)Exposure to oxygen in the air or water causes a chemical change to occur on the surface of the nickel. This results in the nickel turning a black color.
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13y ago
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5mo ago

As nickel ages, it may develop a patina or surface tarnish that can change its appearance. This patina is typically a greenish or bluish color and forms through oxidation reactions with the environment. However, nickel is relatively resistant to corrosion, so it tends to retain its structural integrity even with aging.

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Q: What effect does aging have on a nickel?
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