Take a toothpick and a piece of sliced lemon.
Dip the toothpick in the lemon and write your message in a blank paper.
Now you need a little bit of heat and light to read your secret message.
Light a candle and move the paper on top of the candle without burning it to ashes. It's amazing that you can read your writing.
Hurry up and try it out. Leave some secret messages for your partners.
P.S. send them the link of this blog as well otherwise they won't be able to read it!
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