Invisible ink is fun to use for secret messages to your friends. You can pass your friends notes and not worry about bullies reading them. There are several ways to make invisible ink, but making it with milk is probably easiest.
Instructions
1. Get a writing implement, such as a brush, fountain pen or anything else that can hold some drops of milk on the end. Put a sheet of paper on a flat surface.
2. Pour a small amount of milk into a cup or bowl. If you’re using a fountain pen, you need to make the milk deep enough for dipping.
3. Dip your writing implement into the milk. Write your secret message on the paper. You may want to use a code to make your message even more secret.
4. Allow the milk to dry thoroughly. It may take up to an hour.
5. Hide your message or give it to a friend. To expose the message, the paper must be rubbed over a heated light bulb for a few minutes. Or, you can iron the message through a folded paper bag, but be sure not to catch the bag on fire.
6. Read the hidden message. The fat in the milk browns from the heat to reveal the message.
