Scanning electron micrograph of a hollow rim formed in water drop evaporation on a single crystalline NaCl substrate.

From the article:

Hollow Rims from Water Drop Evaporation on Salt Substrates
Alexandra Mailleur, Christophe Pirat, Olivier Pierre-Louis, and Jean Colombani
Phys. Rev. Lett. 121, 214501 (2018)

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