Onion Epidermal Cells
Take care to obtain a single layer of cells; avoid having the cells fold into several layers.
Try staining with iodine (I2KI) to observe transparent structures in the cell.
Human Epithelial Cells
Try staining with methylene blue.
These single-celled eukaryotes live in fresh (hypotonic) water.
Use methyl cellulose to immobilize.
©Copyleft Peter Chen