Description
Write secret messages with lemon juice and reveal them with heat, exploring chemical reactions and oxidation in a fun, spy-themed activity.
Details
1. Squeeze lemon juice into a small bowl.
2. Use a cotton swab to write a message on white paper with the juice.
3. Let the paper dry completely.
4. Hold the paper near a light bulb (supervised) to warm it.
5. Watch the message appear as the juice oxidizes.
6. Discuss why heat reveals the message.
Materials
Lemon, small bowl, cotton swab, white paper, light bulb