Abstract: To evaluate the special stain ing effect of potassium ferricyanide on vessel basement membrane, using the K₃Fe(CN)₆ to treat the biopse specimen and examine the reaction of basement membrane to it under the electron microscope. The result showed the potassium ferricyanide increased the electroncontrast of vessel basement membrane and clearly showed the ultrastructure of it. The staining method provides a kind of special electron stained technology for studying the ultrastructure changes of basement membrane.

Key words: potassium ferricyanide, basement membrane, electron micosco