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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.
fixed and stained. to make them more visible. Staining provides a reliable means for observing bacteria in terms of their relative size, morphology and cellular arrangement. Stains are solutions of a dye that has been dissolved in water or alcohol. The dye is a salt (like Na+Cl-).