Invisible Ink


  • Lemon juice
  • Water
  • Construction paper
  • Small bowl
  • Cotton swab
  • Fan or blow dryer


  1. Pour the lemon juice into a small bowl. 
  2.  Dip the cotton swab into the bowl and write a secret message on the construction paper. As you write or draw, you’ll see the juice begin to fade as the message seeps into the construction paper
  3. Once you’re done, use the fan or blow dryer on low speed to see your message come back to life! If you use freshly squeezed lemon juice, your message will turn brown. If you use bottled lemon juice your message will become visible when held up to the light.

To keep the fun going, try experimenting with different fruit juices or other liquids you could find in the kitchen (like milk or vinegar!) and see how the message clarity compares to your lemon juice message!