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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.
Simple Stain: A simple stain consists of a solution of a single dye. Some of the most commonly used dyes are methylene blue, basic fuchsin, and crystal violet. Simple stains allow one to distinguish the shape (morphology) of the bacteria. For example, E. coli and Bacillus Subtillus are bacilli or rod-shaped bacteria.