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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.
The stain that is the most sensitive is PAS, but you must learn how to interpret it in order to gain specificity. Colloidal iron stains are unpredictable. Alcian blue stains are simple, but have a lot of background staining.