People have seen it in spy movies, secret messages written through invisible ink. The average person may have all the ingredients needed to make their own invisible ink right in their own kitchen.

In this Summer Science experiment students at Effingham College and Career Academy show us how to create invisible ink using a lemon.

Learn how to make invisible ink in this week's The Science of It.

Coded messages in invisible ink sound like something only found in espionage books, but in real life, they can have important security purposes. Yet, they can be cracked if their encryption is ...