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

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The discussion explains the swirling effect observed when soap detergent is added to milk containing food coloring, specifically mentioning the dye "Ponceau." Soap detergent acts as a surfactant, possessing both hydrophobic and hydrophilic components, which facilitates the movement of the food coloring. The swirling is attributed to the solubility of the dye in the detergent and the influence of Brownian motion.

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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.

Regards
chem_tr
 

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