Alan-
Well, yes. Borates may be non-toxic, but how cleanly do you think a boron fill in this kind of configuration could burn in air? Think about it! It's completely out of the question ! BTW, the answer to the operative question is: Poorly. Boron is toxic unless it is fully oxidized. Fully oxidized. Period. Incomplete combustion is *extremely toxic*. The perfect oxides could be passable for human, but one would have to have criminal intent to try to burn boron in air in a small space. As I said before and will repeat - the body count would be extreme ! Jones From: Alan J Fletcher http://en.wikipedia.org/wiki/Boron Health issues Elemental boron and borates are non-toxic to humans and animals (approximately similar to table salt). The LD <http://en.wikipedia.org/wiki/Median_lethal_dose> <http://en.wikipedia.org/wiki/Median_lethal_dose> 50 (dose at which there is 50% mortality) for animals is about 6 g per kg of body weight. Substances with LD50 above 2 g are considered non-toxic. The minimum lethal dose for humans has not been established, but an intake of 4 g/day was reported without incidents, and medical dosages of 20 g of boric acid for neutron capture therapy caused no problems.
