Stain precipitate

 
stain

Stain precipitate mimics bacteria, including cocci and Mycoplasma species. Generally, the stain precipitate is purple, whereas bacteria are blue (with a Wright’s stain). Bacteria are also more uniform and would be in the same plane as focus of the cells, whereas stain precipitate is slightly outside the focal area of the smear (as can be seen by the fuzziness of the red blood cells in this image).

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