How can you keep pennies from oxidizing?

To prevent pennies from oxidizing, you can coat them with a clear sealant, such as acrylic spray or a clear nail polish, which creates a protective barrier against moisture and air. Additionally, storing them in a dry environment, away from humidity and extreme temperatures, can help reduce oxidation. Keeping them in a sealed container with desiccants can further minimize exposure to moisture. Regularly handling pennies with clean, dry hands can also help prevent the transfer of oils and moisture that can accelerate oxidation.