Comment: Or

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Molten aluminum with impurities picked up from the room it was in? Aluminum can glow yellow with impurities, but I don't know for sure if that's what occurred.

Could also have been from the melted lead and copper batteries on that floor? The floor was a storage floor for UPS units.

Gives the most likely explanation, in my mind.

It's most likely a combination of aluminum, lead, and copper, given what was on the floor. We know it can't be steel because the temperatures wouldn't have been hot enough.

Gives an interesting alternative explanation of what occurred. I hadn't thought of the molten aluminum meeting the sprinkler system, but that'd definitely explain the explosions heard. Not sure if he's right, but it's plausible.

Eric Hoffer