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We report a study on the kinetics of drying of a droplet of aqueous gelatincontaining sodium chloride. The process of drying recorded on video, clearlyshows different regimes of growth leading to a variety of crystalline patterns.Large faceted crystals of $\sim$mm size form in the early stages ofevaporation, followed by highly branched multi-fractal patterns with micronsized features. We simulate the growth using a simple algorithm incorporatingaggregation and evaporation, which reproduces the cross-over between the twogrowth regimes. As evaporation proceeds, voids form in the gel film. The timedevelopment of the fluid-void system can be characterized by an Euler number. Aminimum in the Euler number marks the transition between the two regimes ofgrowth.

Growth kinetics of NaCl crystals in a drying drop of gelatin: transition from faceted to dendritic growth