Pennies are made from copper or copperplated zinc. Copper is a highly reactive metal that will oxidize or discolor quickly. When pennies are first minted they have a bright orange-red color. As time passes, the copper reacts with the different impurities in the air.
How Do You Get Crud off Pennies?
Sarah Jenkins
Senior Technology Editor & AI Specialist
Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.
