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What about writing a letter saying that you are being black=mailed by the victim and you think you have found a way to stop it. (In other words MURDER THEM!!!) If you write with an ink pen you can do chromatography on a sample of ink that came from the letter and different types of ink that came from the suspects pens. They have to find out who's pen wrote the letter.
You can also use a fizzy drink as fuel of vinegar and bi-carbonate of soda. The latter launches quicker so you have to be very quick.Note: The film canister must have an internal seal or it won't work.
I tried it earlier with an aspirin bottle (a plastic 1) and it worked. [B)]