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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.
Most bacteria have no color, so they generate little contrast in the microscopic field. Therefore, to see bacteria with the microscope, it is neccessaryto apply color by using a staining reagent. Once stained, the bacteria may be observed and studied with respect to their morphology (shape, size, and arrangement).