Blue food dye in almond milk shows effects of surface tension and mixing.

Blue food dye in almond milk shows effects of surface tension and mixing.

By Ian Durkin for Fall 2015 Get Wet.
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A drop of dish soap into dyed milk results in Marangoni flow.
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Water gel beads (hydrophilic polymer) soaked in food dye are placed in milk. Flow is induced by soap (Marangoni flow) and by direct manipulation.

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