Water gel beads (hydrophilic polymer) soaked in food dye are placed in milk. Flow is induced by soap (Marangoni flow) and by direct manipulation.

Water gel beads (hydrophilic polymer) soaked in food dye are placed in milk. Flow is induced by soap (Marangoni flow) and by direct manipulation.

By Erick Pena for Fall 2015 Get Wet.
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A touch of dish soap changes the surface tension of milk, moving food dye on the surface in a Marangoni flow.

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