Use Mild Soap for Basic Cleaning Mix a few drops of mild dish soap in a small bowl with warm water. Soak the coin for a few minutes. Then gently rub it with your fingers or a soft cloth. This helps ...

2CuO is Copper Oxide also known as Rust. Rust is formed through a process called Oxidation. We see rust form on a daily basis on metals all the time. Whether it be the rust on your bumper, bike, ...