Wrong wrong wrong and wrong again
Issues:
1. Video color correction.
It would apply to all the colors on the video. So if you have a reference like the flame coming out and it's red (as expected) then clearly the molten metal is truly yellow.
What's that got to do with it? The resolution of the video looks just fine. What were you expecting HDTV in 2001? Actually a poor quality video hinders your cause as it would obfuscate things(like small explosions), but hardly color.
Its freaking daylight!!! You expect a lighting crew hanging from the roof to "illuminate" the shots?
4. Incandescence not the only form of light production, hence not the only factor wrt color of burning material.
True, but there we see that it is molten and not burning. So incandescence is the source of the color.
5. Possibility of impurities in the substance, such as sodium and calcium salts, which when burned, can produce a color change in emitted light from the melted material (in particular sodium salts can turn the color yellow orange).
So how did the salts get there? The WTC is also build with salts? How long would have those salts lasted without burning inside the "magic crucible" required to hold the lead and aluminium you guys claim this is until it became yellow hot? Not much, it would have burned in the crucible and then later (as its about to collapse) fallen as pure molten metal. So your color change theory doesn't stand a chance.
6. No proof from you refuting any of the above, outside of your uneducated opinion.
TAM
True, you've pretty much refuted them yourself by your arguments going in circles and bringing proof to the table that prior counter theories are false. First "it's aluminium", but aluminium would flow away as would lead. Thus we arrive at the magic crucible. But the magic crucible would burn any impurities long before reaching that color and "pouring out just in time for collapse". Any impurities floating on top would hinder the brightness, thus the underlying material would be hotter than visualized. The impurities you mention that "change the color" do so only during their "combustion", but that happened in the magic crucible, remember? The lack of color calibration is bogus, because we have clear pictures of other flames in the frame. So that's a no go.