We need to establish video standards for capture and posting of images. "Timesink" had an image of a piece of debris that looks like part of the Lab module. It's charred and looks to be about 5 feet across.
I saw that on Fox, and noted the color-bands as in tempered steel. There is very little steel on the orbiter (main engines, landing gear is all I can think of offhand).
I believe that titanium displays those colored bands as well, but not sure what the lab was made of.