Write secret messages with homemade invisible ink! All you need is some basic kitchen items and lemon juice.
- Half a lemon
- Cotton bud
- Plain white paper
- Lamp or torch
Make sure your kids aren't holding the paper too close to something too hot, as they might hurt themselves or burn the paper!
Squeeze the lemon juice into a bowl and add a few drops of water.
Get your kids to mix the water and lemon juice together.
Dip your cotton bud into the juice. Write a message onto the white paper.
Wait for the juice to dry so it’s totally invisible.
When the paper is dry, carefully heat it by holding it close to a torch or a bulb, revealing your secret message!
So how’d that happen?
The lemon juice oxidises and turns brown when it's heated, so then you can read the message!