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Slow-moving immiscible liquid

darXide
in Physics

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http://http://www.youtube.com/watch?v=trUfqGW5EHQ

 

Have a look at the video.

 

To his left of the guy, there's this small liquid tank. It's blue, and upon tilting, one of the immiscible liquid moves like a slow wave inside. Could you tell me what is it made of? And how could I create one myself? I just need the liquid ingredients, the mechanism isn't a problem. How is it possible to keep only one of the two liquids blue? The other seems like it's water or clear vegetable oil or something.

 

Thanks a lot guys! <3

 

PS: I'd try mixing water and oil, but then either of the liquids can't be a different color. Plus, the oil would stay on top and water definitely doesn't move slowly.

I can't get the video to work but I think I have seen the sort of thing. My guess would be sugar solution or glycerine and oil with an oil soluble or water soluble dye. If I were trying to home brew it I'd use cooking oil, sugar and water and ink from a water-washable felt tip pen.

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