How to Make an Exploding Pumpkin Face (Blast-O-Lantern)
Exploding Pumpkin Faces! You could try making them this Halloween, but probably shouldn’t. Happy Halloween!
This project is for demonstrational, educational, and entertainment purposes only. It is not intended to be duplicated. CaC2 mixed with water produces acetylene gas, which, when mixed with oxygen, creates an extremely flammable gas.
Step 1: Forming the Gas
A very flammable gas (acetylene) is produced inside a pre-carved pumpkin shell by mixing CaC2 and water. When the gas is ignited, the pressure inside builds rapidly, forcing the carved pieces to blast out dramatically.
Step 2: Ignition
I chose to ignite the gas with a piece of Visco fuse. I found it actually ignites most consistently with a hole just small enough to poke the fuse through, and works better at the back of the pumpkin. I only placed it at the top here so it would be visible. In reality, placing the fuse near the opening at the top leads to premature ignition more often than not, and isn’t recommended.
Step 3: Exploding Pumpkin Faces