The above article does not mention that molten lead would appear silvery just like molten aluminum, when poured in daylight, but that is a fact that could be added to the list of arguments that rule out lead. Dr. Frank Legge states that lead has the same characteristics that make molten aluminum appear silvery when poured in daylight conditions, that is high reflectivity and low emissivity. Dr. Legge has a PhD in chemistry so he really knows what he is talking about:
"There is general agreement that this is a stream of molten metal but there is dispute about the type of metal. Those who support the official story say that this metal must be aluminium from the plane or perhaps lead from a battery backup system. This cannot be true as these metals have very high reflectivity and low emissivity, so appear silvery in daylight when molten and we recall that 9/11 was a clear sunny day. In contrast, iron has high emissivity and low reflectivity so we can readily determine its temperature from its colour. When heated, iron glows bright yellow before it is hot enough to melt." http://scienceof911.com.au/debunking/
