Currently i am try to development suspension cell culture. This my first experience in plant cell. i wanna check viability of cell. For that i make 0.25% evans blue solution in 0.1 mM CaCl2 solution ( Ph 5.6). I wanna comapre staining with unstained cell , stain cell and dead cell so i treat some of my cell with 70% ethanol overnight. then i stain cell both ethanol treated and cell without ethanol treatment for 10 min with concentration of 200 microlitre per ml. And wash with distil water twice. when i see under microscope. I doesn't observe any different between three cell type i.e unstained cell , ethanol treated cell and cell without ethanol treatment. Can any one suggest me better idea.