The effect of fractal fingering can be observed if a droplet of an ink-alcohol mixture is deposited onto diluted acrylic paint. How are the geometry and dynamics of the fingers influenced by relevant parameters?

V0062: Fast Fractal Fingering in Fructose Fluids 74TH ANNUAL MEETING OF THE APS DIVISION OF FLUID DYNAMICS (NOVEMBER 21, 2021 — NOVEMBER 23, 2021)

https://youtu.be/zf1gR-tNzUs

Spontaneous fingering between miscible fluids, W. Song, N. N. Ramesh, and A. R. Kovscek, Colloids and Surfaces A: Physicochemical and Engineering Aspects 584, 123943 (2020).

The instability of long fingers in Hele–Shaw flows, C. W. Park and G. M. Homsy, Physics of Fluids 28, 1583 (1985).