Invisible Ink

What You Need:

  • Paintbrush or toothpick
  • Lemon, orange or apple juice
  • Paper
  • Table lamp or clothes iron


You can write secret messages using fruit!

  1. Dip your paintbrush or toothpick into lemon, orange, or apple juice and write your message on a sheet of paper.
  2. As the liquid dries, it will disappear.
  3. Give your message to a friend and have her warm the paper with an iron or hold it close to a warm lightbulb and your writing will magically appear!
  4. Use caution while warming the paper.


This will not work over CFL or LED light bulbs that do not emit heat.