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Subject Need some chemist help - anyone?

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Original Message I was wondering how much Ammonium nitrate is required per liter of water to drop the temperature, and how much will it actually drop the temp to - freezing? Also, is ammonium nitrate toxic, can you get a food grade, etc? Finally, with all the security these days, can you buy small amounts from a chem house or hobby store or do you need permits and crap? Trying to figure out a way to drop water temps on a prototype item I am constructing, and temperature has become an issue for one device in general... thanks!!

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