This video demonstrates how to make a liquid that turns to ice at the touch of a finger. Must be one of the strangest reactions I’ve ever seen.Sodium Acetate .
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Wow, this video is incredible. Perhaps we’ve got some chemist in the OMB readership who will care to explain exactly how the heck this works! 
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I’m a chemist….what’s going on???
Supersaturation leads to an exothermic crystallization of the sodium acetate (aka, it’s not the water that crystallizes or “freezes”)
what is happening here is that the sodium acetate is super saturated so when the water cools it wont crystalise. when you touch it your finger is acting like a catalist and is allowing the crystals to form