Five vertically insolated samples with different dust-to-water ice ratios at an insolation rate of ~ 3 solar constants. The image series show how the sublimation activity reduces with a decreasing water ice content (online movies). At a 66 vol% water ice content, several ejected particles are visible as elongated bright dashes (in the panels with a timestamp of 0.5 h and 6.0 h) and the whole sample has disappeared after about 6 h of continuous sublimation. The series of pictures with a 33 vol% and 50 vol% water ice content show the erosion of lateral surfaces, the formation of a talus, and the granular structure of the sample material. The first two images of the series with 33 vol% water ice appear brighter because the filter in front of the camera, which reduces the brightness, was not installed and was added during the experiment. The shape of the samples with a 25 vol% and 20 vol% water ice content changed rather in single events (ejections) and did not experience any further visible changes after about 3 h (see Fig. 5A).