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SECRET SCRIPT

Send secret messages to your friends with your own invisible ink

Suitable For

Grade 3

Difficulty

2

Time Required

 <12 Hours

Supervision

Required

What’s it about?

Invisible ink has been used by spies and secret lovers alike for centuries to transmit hidden messages to their partners. Invisible ink isn’t just something you see in James Bond movies; hundreds of liquids, from fruit juices to household liquids, to specially formulated chemicals, can be used as invisible ink.

In this science experiment, become a master of ‘steganography’ by making your own invisible ink from baking soda and send secret messages to your friends:

Topics covered

Invisible ink, Steganography

What will I need?

  • PURPLE GRAPE JUICE
  • TAP WATER
  • BAKING SODA
  • COTTON SWAB
  • WHITE WRITING PAPER

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

This science experiment works because substances such as vinegar or baking soda are either mildly acidic or alkaline, and such an acid or base weakens paper. The base from the baking soda remains in the paper after the water has evaporated and the paper has dried.

When the paper is then held near a heat source such as a light bulb or hot iron, the alkaline parts of the paper burn or turn brown before the rest of the paper does, revealing the message written on the paper!

Like the sound of it?

Why not check out the full worksheet in one of our popular e-books?

This particular science project can be found in any of the following Experiland e-books:

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A project introduction and background, complete listing of required materials, step-by-step instructions on how to carry out the project, why it works, learn more section, as well as a science glossary with all the relevant terms make up each of the all-inclusive science project worksheets in our e-books!

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