Mrs Magpie brought home some Little Hotties (LittleHottiesWarmers.com) and gave one packet to me as she knew I would find it interesting.
They are used as hand warmers etc, during winter outdoor activities. They are little 2"x3" packets of some powder in a plasticized fabric pouch. I
have one in my hand right now and it is indeed warming to maybe 10C above body temperature. The listed ingredients are: "iron powder, water, salt,
activated charcoal & vermiculite."
So, anyone care to speculate on what reactions are generating this heat? |