The Marangoni effect is a fluid dynamics phenomenon in which the movement of liquid are driven by differences in surface tension

This is milk, food colour and soap

https://t.co/1ObntVuOGA https://video.twimg.com/ext_tw_video/1779027049119932416/pu/vid/avc1/640x914/S_pfEI62zWsEU2ZW.mp4?tag=12