The Secret Message Egg

This may look like a regular, innocent egg… but what you cannot see is eggs-actly what makes this egg so special!

How it looks:

Pass a secret message to your friend using this trick. On the outside, the egg looks like any other egg. When the egg is peeled however, a message is remarkably written on the egg inside.

What you need:

• 1 hard-cooked egg (see instructions for hard-cooking an egg below)
• Alum (1 tbsp or 15 mL) (Alum is commonly found at most grocery stores where spices are found.)
• White vinegar (2 cups or 500 mL)
• Fine-tipped paintbrush, toothpick or Q-tip
• Spoon
• Adult helper

Preparation:

Hard-cook one egg. Click here for instructions.
Allow egg to cool. Dissolve alum in vinegar by stirring it with a spoon . Dip a fine-tipped brush, toothpick or Q-tip into the solution and write your secret message on the shell of the egg. When the shell is later removed, the writing will be visible on the egg’s surface.

How it works:

The vinegar dissolves the calcium carbonate in the eggshell, allowing the alum to go through (or permeate) the shell and discolor the egg white.

WARNING – DO NOT EAT THIS EGG AFTER THIS TRICK HAS BEEN PERFORMED!