Fig. 4From: Detecting iron-based pigments on ruthenium-coated ancestral Pueblo pottery using variable pressure scanning electron microscopyTescan Vege 3 XMU SEM secondary image of ruthenium coated sherd at 60 Pa vacuum. Tabs of carbon tape (arrows) added to locate area of sample. Low vacuum secondary Tescan detector (LVSTD) is used which has a turbo-molecular vacuum pump inside the detector. Almost all charging effect is eliminated. Scale 2 mmBack to article page