The sugars used were standard commercial products and, according to the manufacturer, with grain sizes of 2500-3500 µm (coarse sugar), 450-600 µm (fine sugar), 350-430 µm (extra fine sugar), and 20-50 µm (icing sugar). To study the possible mixed effects of grain size and target intensity, we produced a sample with equal grain size but different intensity by spraying a sample of nonfiltered Kivenlahti sand with matt black paint. The intensity of the painted sand was 0.04.