"scott" <sco### [at] scottcom> wrote:
> > And isn't alumina pretty much transparent at the thicknesses it's likely
> > to
> > reach in ambient conditions?
>
> Having had a car with bare aluminium panels, I can tell you that it quickly
> goes dull grey if you don't polish it :-)  I have no idea what the thickness
> is, but it certainly is visibly very different.

Ah, fair enough, I must be thinking of something else.

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