What You'll Need:

•    Half a lemon
•    Water
•    Spoon
•    Bowl
•    Cotton swab
•    Lamp or other light bulb
•    White paper (or print out the cool Doodlebug & Dandelion stationery below!) 

What to Do:

1.    Squeeze some lemon juice into a bowl and add a few drops of water.
2.    Mix the water and lemon juice with a spoon.
3.    Dip your cotton swab into the mixture.
4.    Write a message on the white paper.
5.    Wait for the juice to dry so it becomes completely invisible.
6.    When you're ready to reveal your secret message, heat the paper by holding it close to a light bulb!