Soap lowers the surface tension of milk in the center of a shallow dish, resulting in food dye being pulled towards the edges

Soap lowers the surface tension of milk in the center of a shallow dish, resulting in food dye being pulled towards the edges

By Thomas Pohlman for Spring 2013 Get Wet.
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Soap reduces the surface tension of milk, driving a flow that mixes in food dye.
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Surface tension driven flow. Dish detergent dropped on food coloring in milk reduces local surface tension, which pulls the dye to the edges.

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