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SEM and photographic images of Grade 4 chromatography and silica coated papers without and with dried blood spots: SEM images of (a) chromatography and (b) silica coated paper, and (c) close-up image of the selected area in (b) without dried blood spots; top view of (d) chromatography and (e) silica coated paper with dried blood spots; photograph images of the (f) top and (g) back sides of chromatography paper, and (h) top and (i) back sides of silica coated paper with blood spots.
