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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.
1 Basically a simple stain is staining cells with just one stain, there are two types: basic stains and negative stains. 2  Purpose: to make the cells show up better (from a higher contrast) and to ascertain the cell shape, size, and growth pattern.