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Description

Write secret messages with invisible ink

Resources

 Paper
 Clean paintbrushes or cotton buds
 Iron & tea towel (Dependent on which option is selected)
 Salt & wax crayons (Dependent on which option is selected)
 Paper cups
 Milk and/or lemon juice and/or orange juice

Instructions

Aim of Badge: To encourage an interest in science

This Badge has 15 options of which 4 must be completed
Invisible Ink
Introduction:
 As part of the Brownie Science Investigator badge talk to the girls about what they already know about science
 Do they know any scientists in real life?
 Have they ever done a science experiment before?
 What was the experiment?

Instructions
1. Give every Brownie her own sheet of paper and a paper cup per Six with a little of the liquids in the bottom of it.
2. Using the paintbrushes or cotton buds the Brownies write a secret message on the sheet of paper.

Option 1
The Leader places the sheets of paper under a tea towel and use the iron, without the steam function, to heat the paper until the liquid turns brown in colour and the message can be read.

Option 2
Salt is poured onto the paper with the ‘invisible ink’ and left for a minute. When the salt is removed the Brownies can colour over their page with wax crayon to reveal their secret message.



Acknowledgement/Source:
https://explorable.com/invisible-ink-experiment
Trefoil News Winter 2018

Tags

• Brownie Science Investigator
• brownies
• experiment
• interest badge
• invisible ink
• STEM
• Trefoil News Winter 2018

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