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What is the active ingredient in hand warmers?

I

iluvtruenos

Banned
I have four packets here, all opened at the same time, all shaken equally, and one is already cold (1 hour), one is still warming up, and two are at their peaks.

Now I have a question, what makes them different? My thesis is that the different amounts of activated charcoal and iron filings are the reason for the different heating times. I'm going to cut one open right after taking it from the package, one used one, and one in the middle of the rxn so as to see how much more it activates.

Oh, and 4 hours my ass. :|
 
i've had them go 4 plus for me quite a few times...hit the slopes, make a few runs and come in for lunch, take them out of the glove and they're still quite hot
 
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