Surface tension driven flow. Dish detergent dropped on food coloring in milk reduces local surface tension, which pulls the dye to the edges.

Surface tension driven flow. Dish detergent dropped on food coloring in milk reduces local surface tension, which pulls the dye to the edges.

By Nikita Novik for Spring 2013 Get Wet.
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Soap lowers the surface tension of milk in the center of a shallow dish, resulting in food dye being pulled towards the edges
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Dish soap on a pool of food dye drops the surface tension of oobleck, which pulls the spread of the dye.

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