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A comment on Using saltpetre for cooling drinks (2013). Parent comment

Re:Using saltpetre for cooling drinks (2013) by PBnFlash on Sunday August 28, 2022 @03:28PM (#32631267)
Urea also is endothermic, and as it is used in diesel engines I am quite sure it's available globally.
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Re:Using saltpetre for cooling drinks (2013) by nibbleshifter on Sunday August 28, 2022 @05:14PM (#32632122)
Aye, urea is what's in the "instant ice packs" now.

It used to be ammonium nitrate, but most brands switched it to urea a few years ago - presumably for reasons of "people could use the extremely nice, uncoated, very pure ammonium nitrate for nefarious purposes" (useful for explosives and methamphetamine manufacturing!)

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