Materials:
Empty CO2 cartridge.
2 tablespoons of powder of your choice(flash powder, blackpowder, whistle mix, ect.)
nail
hammer
12 inch long piece of Visco fuse
Small funnel or a sheet of paper.
Take an empty CO2 cartridge. Take the nail(it should be about 1/8 inch wide) and hammer it into the hole at the top of the CO2 cartridge until the hole becomes bigger. Take the funnel and the powder and fill the cartridge up with the powder. Note: It will take a whole for you to fill the cartridge all the way up. I would advise you to do it on a very boring day. Anyways, You only need to fill the cartridge up 1/2 to work properly, but it is a lot more powerful if it is all the way full. When it is full, take the Visco fuse and stick about 4 inches into the cartridge. Take some take and tape the fuse to the cartridge. Warning!!! When these go off, they always produce dangerous shrapnel. Do not just wear safety glasses. If the metal pieces hits you it will go into you. It can kill. Light the fuse and hide behind a big rock or a pile of dirt. Warn other people to get out of the way when lighting this.
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