SC - Chemical heating?

[Jeff Heilveil]

Salut! 
The recent Thread on cooling in period, as well as a mention of chemical
cooling, reminds me of something I ran across recently (might have been on
this list, or more likely in one of the field equipment supply catalogs I
was perusing looking for aquatic emergence traps, which stopped when I
realized I could make them for 8% of the price anyone wanted).  There was
a claim that chemical heating (like the little pads you can get to drop in
your gloves/socks) are actually an ancient Chinese formula.  Anyone know
if it's period?  When it might have moved to the Black Sea area, or Europe
in General?

Thanks in advance.

Cu drag,
Bogdan


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Jeffrey Heilveil M.S.		      Ld. Bogdan de la Brasov, C.W.
Department of Entomology	A Bear's paw and base vert on field argent
University of Illinois		    	  
heilveil at uiuc.edu			     
office: (217) 244-5115
home: (217) 355-5702		       
ICQ: 34699710 	             

Once one dismisses the rest of all possible worlds, one finds that this is
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				 -Voltaire, _Candide_
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