How to produce secret messages without special ink or equipment

Step 1: Collect Materials

Obtain the following
- Lemon Juice
- Cotton swabs
- copy paper
- a heat source

Step 2: Creating Message

Dip a cotton swab into the lemon juice.
Make sure it is not too saturated with the juice.
Write your message onto the paper.

Allow the paper to dry before moving to the next step.

Step 3: Heat It Up!

After drying apply heat to the paper.
Caution must be used in this step so as to not burn the paper.
We used a burner on our gas stove on the lowest setting.
Move the paper so one spot does not become too hot.