One aspect that is extremely important to visualize particle trajectories is the lighting. Since the condensations are quite thin and the lighting needs to be accordingly adjusted. One thing that can be done is to make the transparent viewing chamber out of a non-reflective material, but this can be expensive and not cost-effective since there are other ways to get around this problem. Aim the light through one plane and make the viewing end on another axis (so that the viewer is not bothered by any glare or bright light). For lighting source, I use LEDs, preferably with an intensity adjuster for optimal viewing, but any light-source would be good except for maybe one that gets too hot and may create an unwanted temperature gradient across the chamber, but if it's on top of the chamber that would be okay since there should be a temperature gradient from the top to the base of the chamber (top is usually at room temperature and bottom is at about minus 80 Celsius).P.S. I haven't tried different wavelengths of light, but they would probably work just as well as white light.
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