The aluminum oxide should also rub off as a black residue.
Gregg
"Ian A. Nichols" wrote:
><snip>
>
> Yes, it does look a lot like aluminium. Both are covered in a thin
> surface layer of oxide which gives them a dull grey appearance. If it
> were aluminium you could easily gouge it with the point of a sharp
> knife, but not Ti - though I don't expect you to try that, of course!
>
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