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Simple Stain Lab Essay Preview: Simple Stain Lab Report this essay Purpose: To teach the student the techniques involved in doing a simple stain. To show the three morphological types of bacteria. Materials: Cultures (agar slants). Micrococcus luteus. Bacillus subtilis. Rhodospirillum rubrum. Dyes. Safranin. Methylene blue. Gentian violet. (Crystal violet) Staining rack. Glass slides. Procedure:.