Copper jewelry, or jewelry that is made of an alloy that is rich in copper, can begin to turn green over time, when it is exposed to water and oxygen. If you don't clean it from the jewelry quickly, it can actually begin to break down the metal and corrode the item. If you were wearing a copper ring, the green color can be transferred to your skin. Remove it from the skin quickly. Some types of corrosion can become irritating and some people can develop a copper allergy.
Wash your hands with soap and water. Pay special attention to the green stains on your skin.
Scrub the green stain with a nail brush. Be careful not to damage your skin, but work until the stains are gone, or until they are as light as possible.
Soak a clean cloth in white vinegar, if the green stain is still visible.
Rub the cloth over the green stain on your hand, until the stain is gone.
Soak a cloth in lemon juice, if the stain is still visible.
Rub the lemon juice over the green stain until it is gone.
Rinse your hands with clear water and dry them completely.