What you'll need
- Paper
- Lemon Juice
- Paintbrush
- Heat source (use a radiator or ask an adult to help with an iron)
What to do
- Squeeze the lemon into a cup to get the juice [or use bottled lemon juice]
- Dip your paintbrush into the lemon juice and paint your message on the paper.
- It will go invisible as it dries
- When you're ready to read your invisible message, put the paper on a radiator, or get an adult to iron over it with a warm iron
- The heat will cause the writing to turn brown so your message can be read!
Disclaimer: Please follow the instructions carefully. This is for your own safety and the safety of others. Do not improvise or change the quantities or actions or othe order in which each step in the experiment is listed.