Yes, but you can still see what type of metal it is by the color. For example I showed aluminium and silver. I also showed molten glass, which isn't a metal (that was bright white). Both aluminium and silver were not red, but silvery when molten. So is lead (http://tommcmahon.typepad.com/photos/uncategorized/2007/07/16/cast2.jpg)when melted.
It was claimed here (not sure it was this thread though) that the pouring red hot stuff was "aluminium alloy". But molten aluminium is not red when molten and burned aircrafts burn up rather than melt. Lead from "the UPSs" also melts into a silvery liquid and is not red. What then is that red incandescent stuff seen pouring from the building?
My claim remains...you have not disproven it, because you cannot. The only way that you can tell the metal from the color is when it is at or near its melting point, and even then you may not. The color, beyond the metals original color, only indicates the temperature of the metal, not which metal it is...sorry.
Show me aluminum at 1700F Show me glass at 1700F
http://911research.wtc7.net/cache/wtc/analysis/fires/metcolor.htm
TAM