Always wear eye protection during science experiments. Never handle sharp objects, open flames, chemicals, or other dangerous objects without adult permission and supervision.
Use the knife to cut the lemon in half.
Squeeze the juice from one of the halves into the bowl.
Add a few drops of water into the bowl––just enough to dilute the yellow color from the lemon juice. Then, mix with the spoon.
Dip one of the cotton swabs into the ink and use it like a paintbrush to write your super secret message.
To read your secret message, hold the paper close to (but not touching) the lamp... and watch as its secrets are revealed.