Stain used in electron microscopy
Phosphotungstic acid is electron dense, opaque for electrons. It is a common negative stain for viruses, nerves, polysaccharides and other biological tissue materials for imaging by an Electron microscope.
2.5% FAM
Phosphotungstic acid
Saffranin
Coomassie blue
General Microbiology Pa 1 (History, Microscopy, Stains and Structure and Physiology of Bacteria)