"Mike" <win### [at] hotmailcom> wrote:
> #declare AlcoholRegion=
> box { <-1.899, 0.2, -1.899>, <1.899, 3, 1.899>
> ...
> #declare HeavyLiquidRegion=
> box { <-1.899, 3, -1.899>, <1.899, 5, 1.899>
> ...

Avoid coincident surfaces - it's a known problem in POV-Ray. Give the boxes a
tiny bit of spacing in between, or have them overlap a tiny bit.

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