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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.
This is because of the lack of contrast coupled with the small size of the. bacterial cell. The use of stains that react chemically with cell material will enhance the contrast. between the cell and the background. A stain is a dye consisting of a colored ion (a. chromophore) and a counter ion to balance the charge.