What kid doesn't love the idea of a super secret note… where the message is revealed only to them? Writing with invisible ink is a fun thing to do- and very simple- using supplies that you very likely already have on hand at home. Here's how to make invisible ink:
- lemon juice (I used the bottled kind found at the grocery store)
- something to write with- such as a thin paintbrush. You can also use a toothpick
- plain paper
- an iron
You can explain to your kids that what actually happens is: the ink (lemon juice) weakens the fibers in the paper when you apply it. So when the paper is heated, the fibers weakened by the lemon juice discolors (burns) before the rest of the paper. And that's how you see your message!
This is one cool craft idea that would be great for next year's science fair!
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