I'm working on a project that includes some illuminated parts moving around in viscous, translucent liquid. If this was for a movie or something with limited exposure I would have a lot of options - stirring up stuff into a suspension looks great - but most cloudy liquids settle or separate eventually.
Has anyone got experience with cloudy goo? I'm looking for something like watered down milk, but thicker, and less prone to spoilage. Ideally, though this is less important, I'd love a substance that diffuses light enough that I could change its apparent color with LEDs from underneath.