How to Write a Secret Message If you follow these steps, you can write a secret message with
lemon juice. For this experiment, you need lemon juice,
a brush, paper, and a candle .
First, wet the brush with lemon juice .
Second, write a secret message on paper with the brush .
Third, let the paper dry .
Finally, heat the paper with a candle .
If you do this, you can see the secret message show up
slowly . Keep your message secret this way!