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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.
Acid-fast bacteria, of which there are very few---the major. genus Mycobacterium, have a high concentration of mycolic acid, a lipid, in their walls. Although difficult to stain, once the stain goes into the wall, the cell will not de-stain or. decolorize easily. The ability of the bacteria to resist decolorization with acid (1 %) alcohol confers acid -fastness to the bacterium.