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Drops on a Partially Wet Surface

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Oblique view of a blue droplet striking a dry (white) surface and a (red-dyed) wet surface. The portion of the drop hitting the red film forms a purplish corona splash.

A side-view of a similar impact shows a small blue portion of the corona splash and a much larger purple one. Text reads: "The side view reveals the interplay between the liquid film and the drop"

The top view after a blue drop hits the red film. Capillary waves spread from the impact region. 5-6 purplish petals spread from the point of impact, which still appears blue. Text reads: "The top view allows us to characterize the spreading and expansion of the film. Capillary waves are generated by the impacting drop and influence the contact line"

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