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Mercury thiocyanide {wiki} is the chemical once used in the fireworks called "snakes". Burning it produces poisonous mercury vapors. So don't try this at home! -via the Presurfer
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But then Ali S. has a good point about the witch trials!
Mom banished us to the road after we filled the entire yard with sooty curls. Did you know that stuff turns into a black paste when it gets wet, and makes awesome shoe-prints all over freshly-cleaned carpet...? ;-)
--TwoDragons