Two common fluids that don't mix inside a labyrinth [closed]








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I'm not sure in which SE site put this question.  

Imagine a typical child toy, where a bunch of spheres move by gravity through a labyrinth.  

Now imagine a sealed small labyrinth with two fluids. I'd like to reproduce the concept of one fluid moving through another forming small bubbles, but I don't know which common fluids might be useful. Theose two fluids should not mix, the viscosity must be low (so the bubbles can move easily), both fluids must have different colors, they must have different density, the bubbles should not stick to the plastic of the labyrith, it should work at room temperature, and -if possible- I'd like to see many small bubbles instead of a single big bubble.  

Which two common fluids might be useful? I tried air inside water (few bubbles and movement too fast), I also tested water inside kitchen oil, but it moves too slow and the colors aren't quite different.


