Tag Archives: invisible ink

45_Secret Messages (Invisible Ink)

30 Dec

Ever wondered how spies and secret agents make secret messages?

© 2011 Fernanda de Uriarte

WARNING: It is really quick and easy to make secret messages, however in order to make secret ink work you need fire, so this toy requires adult supervision.

You’ll need:

_Half a lime

_A thin brush

_A piece of paper

_A lighter

_Adult supervision

How to make secret messages:

1. Dip the tip of your brush into the lime. You can also squeeze the juice out of the lime into a container and dip the brush into the container.

2. Write your message onto a blank piece of paper. You’ll need to get more invisible ink (lime juice) every letter or two.

3. Let the lime dry for a few seconds. Your piece of paper will look as if it had nothing on it.

4. To reveal the message, get an adult to pass the flame of a lighter gently under the paper, all the way through your secret message.

© 2011 Fernanda de Uriarte

Watch letter by letter appear in front of your eyes!

© 2011 Fernanda de Uriarte

© 2011 Fernanda de Uriarte

© 2011 Fernanda de Uriarte

© 2011 Fernanda de Uriarte

Be careful with the lighter… you don’t want to burn too much. (have some water next to you, just in case)

© 2011 Fernanda de Uriarte

Think twice next time you find a blank piece of paper!


(Thanks K!)