To make a science flask cake - Make a round 2 layer cake. Stand a cardboard paper towel tube up in the center. Then frost it to look like a science flask. Add a bit of cotton candy coming out of the top so it looks like it is smoking or bubbling over.
As a party favor, send a "crystal making kit" home with each guest:
Crystal Making Kit:
Pipe cleaners and a bottle of alum (find in the spice section of the grocery store).
Give these instructions with the supplies:
Pour 2 cups of water into a 1 quart jar. Add entire bottle of Alum. Heat in microwave 3 to 5 minutes. Let cool. Make a shape out of a pipe cleaner. Place pipe cleaner into the jar. You can hang it into the jar by wrapping one end around a pencil and setting the pencil over the jar.
Leave the pipe cleaner in the alum solution for 2 hours. The longer you leave it, the larger the crystals (we like to leave ours for a few days!)