Pure aluminum doesn't glow very strongly in sunlight, but in darker areas and mixed with other materical it does.
Jones rebuttle to that claim was to mix an unknown amount of wood chips and plastic shavings at an unknown temp.
However what he should of done was put in a large amount materical that was in the towers such as, glass, wood, hamburger meat (gross yes!), water, copper etc....and heated this up to around 1000C
You can ask various meal experts to conferm.
One example is Stephen Chastain.
http://stephenchastain.com/ You can read his answer in the talk section.
Here's a short summary:
The flow is not steel because the structural steel would fail well below the metling temperature. The flow is likely to be a mixture of aluminum, aluminum oxides, molten glass and coals of whatever trash the aluminum flowed over as it reached the open window. Such a flow would appear orange and cool to a dark color.