> > BTW, what is the ior of oil? And it might be nice to have the light
> > coming from the other direction, so the caustics aren't hidden by the
> > bottle as much.
> 
> I have no idea, used 1.33 (water) as it looked nice.

Well, I don't know if this is any help or not, but 1,2,3 Propan-triol 
(also known as Glycerol) has the same IOR at 20 degrees C as borosilicate 
glass.  Unfortunately I don't know any numbers off the top of my head.

OK, scratch that, apparently olive oil has an IOR of 1.47, as according 
to :

http://oldsci.eiu.edu/physics/DDavis/3050/Ch16R&R/Intrnl.html

You know, sometimes I really like Google...

Bye for now,
     Jamie.

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