Dish soap on a Q-tip drops the local surface tension of dyed milk_ the higher surface tension at the edges pulls the dye outward.

Dish soap on a Q-tip drops the local surface tension of dyed milk_ the higher surface tension at the edges pulls the dye outward.

By Blake Buchannan for Spring 2013 Team Second.
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Food dye in milk illustrates laminar mixing by vortexes and stretching.
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Dyed water beneath vegetable oil was sheared by a moving obstruction, resulting in a Kelvin-Helmholtz instability.

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