On the following photos the processed sample № is on the right side. The diameter of the oil stain in the check sample exceeds the diameter of the stain in the processed water (А4). Eventually the stain in the check sample has increased almost two times as much. The stain in the processed sample has increased insignificantly (it is impossible to take a proper photo because the transparency  of the spread stain prevents us to do it). Thus even on this photo you can distinctly see the difference in the stains’ diameters.