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?

The initial oxide layer. It slows further oxygen access to the bulk beneath.
Aluminium oxide is particularly effective at this - many high-temperature
alloys are designed with this phenomenon in mind.

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