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Related to Gram method: Gram staining
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|Noun||1.||Gram method - a staining technique used to classify bacteria; bacteria are stained with gentian violet and then treated with Gram's solution; after being decolorized with alcohol and treated with safranine and washed in water, those that retain the gentian violet are Gram-positive and those that do not retain it are Gram-negative|
staining - (histology) the use of a dye to color specimens for microscopic study