Treasure Map...

Draw your map.

1 teaspoon of bicarbonate of soda, 2 teaspoons of water mixed in a cup.

Paint with mixture as to where you want to secret your treasure on your map.

Leave to dry.

Leave instructions to bake the map at 150c for 10 minutes and hey presto, the secret is revealed.

We left secret cakes for our neighbours using a secret map today.