Follow these steps to create and reveal your hidden message:

Prepare Your Materials
Set out a piece of plain white paper and pour some lemon juice into a small bowl or cup. Get a cotton swab ready to use.

Write Your Message
Dip the cotton swab into the lemon juice. Use it to write a secret message or draw a picture on the paper. The juice will leave wet marks that will disappear as the paper dries.

Let It Dry
Let the paper dry completely. This step is important. If the paper is still wet, the message won’t work as well.

Reveal the Message
With adult help, gently heat the paper to make the message appear. A hair dryer or a 100-watt light bulb works best. Slowly move the heat over the paper. The hidden message will turn brown and become visible.

Stay Safe
Always have an adult help with the heating step. Make sure the heat source is safe and never leave it unattended. Do not use open flames or anything that could burn the paper.

For more information, see https://scoutermom.com/9896/invisible-ink-demonstration/