- 1 lemon or a bottle of lemon juice
- Bowl and spoon to mix
- White paper
- Lamp or something else that creates heat
Step 1: Squeeze lemon juice out of lemon (or use the lemon juice out of the bottle) into the bowl.
Step 2: Add a few drops of water.
Step 3: Stir together until both are combined.
Step 4: Dip the Que-tip into the mixture and use to write your message on the paper.
Step 5: Allow to dry. The message will be invisible once completely dry.
Step 6: To read the message, heat the paper using a lamp or something else warm (make sure children have adult assistance while heating). The heat will reveal the message!
For more information, see: http://www.sciencekids.co.nz/experiments/invisibleink.html