Posted: 7/18/2012 7:02:54 AM EDT
superglue. I never knew you could actually do this! Thought I would share.
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Not spontaneous combustion.
Heat builds up and the cotton traps it to where it continues to heat up past the combustion point of the cotton. Same principle as using varnishes on rags and throwing them in a metal container. Good way to burn garages and houses down as the heat builds up. ALWAYS open them up and let them dry in open air. Like first poster said, not efficient but can be done. I find the best way is my brazing torch on a coleman propane tank. I take that hunting/camping. I know how to make fire with lighters, matches, firestarters, bow, canoe, drill... as I've done them all. I go with what's most efficient and a torch at a couple thousand degrees does it.  No need for tinder.
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Quoted:
Exothermic reaction?? Yes. The very large surface area of the cotton ball (the thousands of fibers and their SA that make up the ball) will allow for quick oxidation and in such a tiny area the heat buildup gets very large. Once you hit the combustion point of the cotton... well thar' she blows. 
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