Superhydrophobic Surfaces. Black silicon surface (Black Si, Fig. ) was fabricated by maskless cryogenic deep reactive ion etching as described in the literature. Glaco samples were made by spray coating clean glass slides with a layer of hydrophobic nanoparticles (Glaco Mirror Coat Zero, Soft 99 Co.) and were placed vertically to dry for one hour before use (Figure ), following the manufacturer's instructions. Rebound Experiments, Polydisperse submillimetric-sized droplets (radii R = 20-450 µm) were generated using a spray bottle resulting in a wide range of impact speeds U I = 4-700 cm s -1 . 2 wt% calcium chloride was added to minimise evaporation with minimal changes to the droplet's surface tension. Millimetricsized droplets (R = 1.3 mm) were dispensed using a syringe and needle, and dropped from different heights to achieve different impact speeds U I = 7-50 cm s -1 .