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Invisible Ink

In & Outdoor Free
Chemistry, Science Fair

Activity Overview

Be your own secret agent and write secret messages for others to read with homemade Invisible Ink. You can actually use a lemon to write secret messages! The juice of the lemon fruit contains carbon compounds that are nearly colorless in nature when dissolved in water. When they are heated by a lamp, the compounds start to break down and produce carbon which is dark in color.

My kids really got into using invisible ink and it has become a way of communicating that has bonded the kids together. The enjoy the secret writing and unveiling of their messages and I am sure that yours will too.

Materials Needed

  • 1 Lemon
  • Cotton swabs
  • Water
  • A teaspoon
  • A small plate
  • A Lamp and light bulb
  • White paper

How to make it

  1. Squeeze some lemon juice onto the small plate.
  2. Add a few droplets of water and mix the solution well with a teaspoon
  3. Use your cotton swab as a writing utensil. Dip it into the solution and write a message on the white paper.
  4. Allow the paper to dry.
  5. Hold the paper near a hot light bulb to reveal the secret message.

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