Do you ever get the itch to really tell someone something without the teacher knowing? Well here's how!
What you can use:
Salt water
Milk
Coke
Tea
Vinegar
Lemon Juice
A blunt Twig
Heater
Printer paper
Procedure:
Get a piece of printer paper and a bottle of milk. Then simply dip the twig in the milk and write your secret message with it ( be careful not to scratch the paper!). Give the piece of paper to your friend and tell them to simply apply heat. Then see how it turns out!
I predict:
As soon as you apply the agents to the paper it will become visible. Then the agents will dry out and become invisible. When you apply heat the writing will become visible again!
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