Making invisible ink is a lot of fun! You can pretend you’re a secret agent as you keep all your secret codes and messages hidden from others. All you need is some basic household objects and the hidden power of lemon juice.

Squeeze some lemon juice into a bowl and add a few drops of water. Mix the water and lemon juice together with a spoon. Use a cotton swab or paint brush to use this mixture as ink for writing or drawing! Wait for the liquid to dry on the paper so it becomes completely invisible.

When you are ready to show the secret message or drawing, hold the paper near a source of heat such as a light bulb! Lemon juice is an organic substance that turns brown when it’s heated, but diluting it with water makes it hard to see without that heat. Use this fun trick to create hidden maps or clues for a special adventure!