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Science Time-out!
Oxygen and acetylene, in the proper ratio, burn at a temperature of 3160C.
MAPP, when combined with oxygen, has a welding temperature of 2927C.
The best a propane torch can do is 1995C.
Magnesium melts at 650C and its autoignition point is 473C.
Aluminum melts at 660C and I couldn't find its burn point, only the burn point of other things like Aluminum oxide or Thermite.
It should go without saying that one should avoid at all costs doing an impression of the firebombing of Dresden or Hamburg in one's workshop.
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