Milk and food dye move due to surface tension when dish soap is added. Bicarbonate of soda and vinegar adds the fizz.

Milk and food dye move due to surface tension when dish soap is added. Bicarbonate of soda and vinegar adds the fizz.

By Ryan Lumley for Spring 2014 Get Wet.
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The wake of a Qtip dragged through food dye in milk produces vortexes in its wake due to the confinement of the bowl.
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Surface tension driven flow of food dye in milk, modified by olive oil and salt.

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