Kids Science Activities
Write with Invisible Ink At Home
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Materials Required
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A few pieces of paper
Cotton buds to write
Solutions like sugar solution, fruit juice, salt solution
A pen to note different solutions used
A toaster to heat and read messages
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Method
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- Take the cotton buds and dip each of them in a separate solution (sugar solution, fruit juice, salt solution) and write the messages on separate pieces of paper. The writing will be invisible.
- Note down on one side of the sheet the solution used to write invisibly.
- Allow the writing on the paper pieces to dry for some time.
- Turn the toaster on and hold the paper with messages over the heat in the toaster. Stop when the paper turns brownish, but not burnt.
- See if you can read the messages. If yes, send secret messages to your friends by invisible writing method.
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What is Learnt
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Heat helps to make sugar into toffee, and fruit juice into a compound of sugar and protein that is contained in them revealing as a visible message.
Invisible writing is seen due to a compound being formed on exposure to heat.
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Conclusion
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* You will be able to read what you wrote with the invisible ink, sugar and fruit juices being better than the salt solution.
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| Comments on this article |
| mike,cho, korea | Friday, April 15, 2011 |
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| graet stuff |
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| GS, VA | Tuesday, October 19, 2010 |
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| great stuff |
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