Material Detail

The composition of United States one-cent coins (pennies) has changed over time due to economic pressures and fluctuations in metal prices. Historically, pennies were produced using copper-rich alloys, consisting of approximately 95% copper with a small percentage of zinc added to improve mechanical strength. Copper was selected because of its durability, corrosion resistance, and ease of minting. However, as the market price of copper increased, manufacturing coins using primarily copper became economically inefficient.

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