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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.
Therefore, cationic dyes such as methylene blue, basic fuchsin, or. crystal violet are useful for the direct staining of cells, whereas anionic stains, such as eosin and. nigrosin, will not directly stain bacterial cells. However, negatively charged stains, are useful for.