Dig out that pile of pennies you've been saving and make yourself a copper-plated nail.
2 to 4 oz. lemon juice or vinegar (60-125 mL)
10 to 20 dull copper pennies
large, clean nail
small glass or jar
What to do:
Put the pennies into a glass and cover them with lemon juice or vinegar. Add a pinch of salt. Let them stand for 2 or 3 minutes.
Clean the nail with scouring powder and water. Then add the nail to the solution. Wait at least 15 minutes. Then fish out the nail.
The nail is coated with copper.
Copper from the pennies interacts with the acid of the lemon juice to form a new compound (copper citrate). When you insert the nail into the solution, the compound plates the nail with a thin layer of copper that cannot be rubbed off.
Once you've got your copper nail, you might want to wear it on a string.
Be careful not to get the lemon juice or vinegar in your eyes, it will burn