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"Oh boy"
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Staphylococcus epidermis
Gram-positive
Escherichia coli
Gram-negative
Gram-positive
Thicker layer of peptidoglycan
Gram-negative
Thinner layer of peptidoglycan
First Step
Primary Stain: Crystal Violet
Second Step
Mordant: Gram’s Iodine
Third Step
Decolorizing Agent: Acetone-alcohol
Fourth Step
Counterstain: Safranin
Gram-positive
Purple (Crystal Violet)
Gram-negative
Pink or Red (Safranin)