Alain Martel <kua### [at] videotronca> wrote:
>
> I've experienced with negative ior. That makes the surface behave as if
> it had
> finish{ reflection 1 }
>
That's an interesting observation. With my own tests here, I was not sure a
'negative' ior was having any effect when lower than 0.5-- until I re-positioned
the crystal and camera 'just so'. Then I could see at least my sphere inclusion
subtly changing its appearance as the ior decreased. But as a practical matter,
the more negative it goes, the less of a visual change there is.
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