Step 1: What you will need
A clear plastic sandwich bag (you can get these at wal-mart or any other grocery store).
2 1/2 cups of water.
A bottle of lime juice.
2 teaspoons of salt.
Two or three paper clips
And some shiny pennies.
You will also need a bowl and a spoon which is are not in the picture.
You should have these things around your house. Therefore, they should not be that hard to come by.
Step 2: Add the water
Next add two teaspoons of salt. (table salt will work fine)
Mix it with the spoon to get the salt off the bottom of the bowl.
Step 3: Add the lime juice
Step 4: Add the mixture to the bag
Then drop the pennies in to the mixture. Seal the bag and this is what you should have.