This is a simple experiment you can easily replicate at home using things you may find around the house. It's something people of all skill levels can do and can be a fun little experiement to do with the kids.
List of materials:
Oxidised Copper - copper coins or copper fittings, should be dull indicating it's oxidised
Weak Acid Solution - white vinegar or lemon juice is best to see results
A Glass container - best for seeing the results
Wire wool or other abrasive cleaner.
An iron nail - not galvanised