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Eat a whole jar of mustard. Wait about 4 hours. Poof! Homemade mustard gas. Maybe some Grey Poop-on. If you were looking for a serious answer to such a harmful question, you will have to use something different than Wikianswers. We have many younger members that really dont want or need to know how to make a chemical reagent capable of maiming or killing someone. I went to school and his was never on a test I had to take.

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17y ago

What else can I help you with?