The trick to remembering the difference between gram positive and gram negative bacteria is to first understand where their naming convention comes from. I have an article follow by a mini game to ...

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Gram cells---Gives a side-by-side visual comparison of the differences of a gram positive and a gram negative cell

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Gram negative and positive cells---This diagram displays both gram negative and gram positive cells and their cell wall composition. Having both drawings beside each other is great for comparison.

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Gram staining: a differential stain that differentiates between Gram-positive bacteria (purple) and Gram-negative bacteria (pink) using crystal violet as a primary stain, iodine as a mordant, alcohol as a decolorizer, and safranin as a counter stain.

Gram-negative bacteria: do not retain crystal violet dye in the Gram staining protocol; a counterstain (safranin) is added after crystal violet, coloring all gram-negative bacteria with a red or pink color; has a thinner peptidoglycan layer so it does not retain crystal violet

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