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Soaking a copper penny in lemon juice makes an old penny look new. Lemon juice removes the copper oxide coating. Adding salt to the lemon juice will clean the penny more effectively. This simple experiment is an easy way to demonstrate some basic scientific principles about oxidation and chemical reactions to children.
a) How to juice a lemon with a reamer. 1  If you wish to remove the peels and seeds of the lemon, you can use a reamer. 2  Cut your lemon into two, and then scoop the succulent part of a lemon into a cup. 3  Press the lemon with the reamer gently. 4  Twist it as you press in order to collect as much juice as possible.