Development of a Rayleigh-Taylor instability at the interface between (top) silicon oil and a denser water-ethanol solution (blue) and (bottom) an elastoplastic solid concentrated emulsion (white), and a denser salt solution.

From the article:

Rayleigh-Taylor Instability in Elastoplastic Solids: A Local Catastrophic Process
I. Maimouni, J. Goyon, E. Lac, T. Pringuey, J. Boujlel, X. Chateau, and P. Coussot
Phys. Rev. Lett. 116, 154502 (2016)

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