How does adding soap detergent to milk create a swirling effect?

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The swirling effect observed when soap detergent is added to a dish of milk with food coloring is primarily due to the properties of surfactants. Soap detergent contains both hydrophobic and hydrophilic components, which interact with the milk and food coloring. The food coloring, likely a dye such as "Ponceau," becomes soluble in the detergent, leading to the movement and dispersion of color. Additionally, Brownian motion may contribute to the swirling effect, as the random movement of particles in the liquid enhances the mixing process.
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For those who haven't seen it, if you put a little soap detergent in a dish of milk with some food coloring in it, you will see the food coloring swirling around and away. Why does this occur?
 
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Hello,

A soap detergent is a surfactant, having both hydrophobic and hydrophilic parts in the framework. A food coloring is possibly a dye such as "Ponceau". The swirling effect is possibly due to solubility of the dye in one part of detergent, with involvements of Brownian motions. I'm not sure about the second though.

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chem_tr
 

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