The wake of a Qtip dragged through food dye in milk produces vortexes in its wake due to the confinement of the bowl.

The wake of a Qtip dragged through food dye in milk produces vortexes in its wake due to the confinement of the bowl.

By Eric Fauble for Spring 2014 Get Wet.
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Colored india ink diffuses slowly into water.
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Milk and food dye move due to surface tension when dish soap is added. Bicarbonate of soda and vinegar adds the fizz.

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