Invisible Ink: A Citrus Painting Experiment
Recipe type: Science
- Lemon or Lime Juice
- Paint brush or Q-tip
- Squeeze lemon or lime into a bowl.
- Paint the juice onto your paper with a paint brush or Q-tip.
- Wait for the paper to dry.
- Heat the paper with an iron, hair dryer, light bulb, or other heat source. Be careful that you don't hold it there to long, as it could burn the paper.
Experiment with other liquids: milk, orange juice, white wine, vinegar, and apple juice are good bets.
Recipe by TinkerLab at http://tinkerlab.com/invisible-ink-a-citrus-painting-experiment/