Science Fun

Polishing Pennies



  • Lemon Juice
  • Dirty Pennies
  • A cup
  • Paper Towels
  • Taco Sauce (optional)


  1. Put a dirt penny in the cup and cover it with lemon juice.
  2. Wait about five minutes then remove the penny and wipe it off with a paper towel.
  3. Try the taco sauce to see which works better.

How it Works:

Pennies are made out of a metal called copper. The copper mixes with oxygen, the same gas that we breathe. This cause something called oxidation and makes the penny look dirty. Lemon juice has acid in it that removes the dirty color or oxidation and makes the penny nice and shiny again!

Extra Experiments:

Does vinegar work?
If you color the penny with marker does it come off?
Does it work with nickels, dimes or quarters?

Science Fun For Everyone: Science Explorer Kit

Product Description:
You can now enjoy the excitement and educational entertainment of a Science Fun For Everyone Science Camp in the comfort of your own home! The Science Fun For Everyone: Science Explorer kit was designed and hand packed by the scientists at the Science Fun For Everyone laboratories in Cary, North Carolina. Each experiment was specifically chosen to not only educate, but excite. The student will explore chemical reactions, super absorbent polymers, rocks and minerals, weather, space, the oceans, crystals, slime and much much more! Please click here or on the images below to view our science kit on Amazon.