Just before 9:52 a.m. a bright spot appeared at a window on the 80th floor of the South Tower and a glowing liquid poured out for about four seconds; there were many such flows from near the same spot in the seven minutes before the collapse, and none from anywhere else. NIST concludes it was molten aluminum from the aircraft. [1]
Critics say molten aluminum looks silvery and that orange-yellow means hotter iron. NIST agrees pure aluminum would look silvery, but says this metal was very likely mixed with hot, partly burned furniture, carpet and computers, which “can display an orange glow, much like logs burning in a fireplace.” [1]
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