Mike wrote:

> I commented out all the isosurf stuff and added
> box{ <-1.899,.21,-1.899>,<1.899,3.01,1.899>
> to the top of the AlcoholRegion
> and: box{<-1.899, 3,-1.899>,<1.899,5,1.899>
> to the HeavyLiquidRegion

Hmm, I wonder if this is related to the small strip of
coincident surfaces at the sides of your overlap. I just
made a small test using two copies of a transparent
object as in

#declare OBJ = sphere {y,1 pigment {color rgbt 1} interior {ior 1.5}}

object {OBJ}
object {OBJ}

and the refraction of the background was wildly different when
the second object was present (but not when the second object
was scaled up a tiny fraction). Also funny thing: I did not
observe this effect when the sphere was centered at 0.

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