Actually you want to use glass2. The original glass material is a pain in the butt when dealing with multiple layers of different transitions; air->glass->liquid->air->glass->air. You can't use the straightforward index of refractions.  You have to use the ratios at the various boundaries. This is a modeling and shading nightmare.

With glass2, you deal with boundaries between volumes. Each mesh surface has an outer volumetric material and an inner volumetric material. Lux then handles all the transitional ratios on its own. While this seems more complicated (as you have to define three things for each surface), the volumes can be defined once and reused. So you define one for air, one for glass, and one (or more) for your liquids. Then for each mesh polygon (material) you specify what's on the outside and what's on the inside. We'll get to this eventually in Luxpose.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)