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. 2015 Sep 10;5:14030. doi: 10.1038/srep14030

Figure 9. Optical micrographs of contaminated coatings and oil-impregnated microfiber cloth before and after smudge test on flat and the superoleophobic layer-by-layer composite coatings.

Figure 9

Dark spots on coatings and cloth indicate silicon carbide particle contaminants.