We're going to attempt identification of the molten metal seen flowing outside WTC 2 just before it collapsed. An earlier analysis of melting points revealed that Occam's razor would point to steel or copper as the primary source of metal at the WTC. We can test that deduction now by using those materials as reference.

First, watch the video of the event:

Now watch this second video of the same event...only the camera does not pull away before the collapse itself...

Now watch this third video of the event. The first glimpse begins mid-way through the clip and we can see the development of this event over a brief time period:

We'll begin by looking at the first picture of the molten metal:

9:53.51am, 11th Sept 2001 - Molten Metal at WTC 2

Now let's look at two reference pictures and see if we can match the metal based upon characteristics.

Reference image for copper

Reference image for steel:

Upon examination we can see that the texture is pretty much the same for both copper and steel in liquid form. The difference is that the steel is white hot, whereas the copper has a vivid yellowish appearance.

Comparing it with the photo from the WTC, we can see that the colour and temperature is consistant with copper, not steel. The deduction based on the analysis of Occam's razor made in Part 1 also appears to be holding.

At this stage, it is important to note that some form of eutectic reaction is supposed to have played a role in lowering the melting point of the structural steel. Thus we could still be observing steel, but at a lower temperature. If we now examine this next photograph of steel, we do indeed observe the same colours and tones.

Reference Image #2 for Steel

Either way, for this to occur the temperature locally had to exceed 1080°C. We know this from observing the colour which we can match against the metal colour temperature charts. Whilst the melting point will be lowered with a eutectic reaction, it does not impact the temperature indicated by colour.

There is no evidence to suggest temperature were anywhere near that high. NIST has no samples that were subjected to temperatures above 600°C and stated that most areas only saw temperatures of 250°C. There are further images of this event, so whilst this image may prove to be inconclusive, perhaps we will be able to confirm steel or copper from the additional images.

This event is physically impossible without some form of localised additional heat source, an accelerant.