Silver stains the intercellular cement dark between adjacent cells.
Notice how corrugated the cell membranes are. Slide 2 High power view of endothelial cells lining a small blood vessel cut in cross-section. Slide 3 Low power view of larger vessels, showing endothelial nuclei lining the lumen. The yellowish cells filling each vessel's lumen are blood cells. Note the dark chromatin clumps in the nuclei.