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A basic stain stains the bacteria (the stain is a positively charged molecule that attaches to cells which are negatively charged or to negatively charged molecules in cells.) A negative stain does not stain cells (why its called a negative stain), it stains the background around the cells.
1 When in solution, starch and iodine turn a dark blue color. 2  Malachite green-a blue-green counterstain to safranin in Gimenez staining for bacteria. 3  This stain can also be used to stain spores. 4  Methylene blue-stains animal cells to make nuclei more visible.he most basic reason that cells are stained is to enhance visualization of the cell or certain cellular components under a microscope. Cells may also be stained to highlight metabolic processes or to differentiate between live and dead cells in a sample.