>> I've got a box of hand warmers at home. They contain a super-saturated
>> solution (of what I don't know). Once you provide a nucleation point,
>> the whole lot crystallises within a few seconds. It also gets quite warm
>> in the process. (This is what makes it good for warming your hands.)
>
> Sodium acetate. I've made my own countless times in my life. And
> recently made a big enough batch to create the super-saturated solution
> (actually melted crystals) to crystallize. Very cool to watch. Drop a
> tiny sodium acetate crystal in, and it grows out from that and warms the
> container nicely.

And here I was thinking it was sodium thiosulphate...

Post a reply to this message