On 3 Sep 2009 05:39:36 -0400, Warp <war### [at] tagpovrayorg> wrote:

>scott <sco### [at] scottcom> wrote:
>> It's just the dull grey of aluminium oxide you are seeing on the outer 
>> surface.  If you looked close and polished them a bit you'd see nice shiny 
>> aluminium :-)
>
>  What stops the aluminum from oxidizing all the way through?

Aluminium oxide. Aluminium is so reactive that it almost instantly forms a skin
of aluminium oxide which insulates it from the surrounding air stopping it from
oxidising further. 
-- 

Regards
     Stephen

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