Creative Speculation

As entertaining as threads like this are, here's another opportunity to miss an opportunity to learn a couple of things:

(1) If this guy had heated any metal to 1800F, it would glow at about the same color, whether or not it melted. If he had used lead instead of aluminum for this experiment -- like the lead in the large number of UPS storage batteries on that floor -- it would have melted, and it would have looked the same as aluminum pouring out of the crucible. There would be no way to tell from video which it was.

(2) Videos don't show true color, especially when they get blown out from excessive infrared, so trying to estimate the temperature from a video is worse than worthless; it's misleading. The brightest spots in both this guy's video and the WTC video are blown out to white, but since he tells us his aluminum is 1800F, that is certainly not white-hot.