Staining Techniques

Simple Stain

Green organisms against light background.
Primary dye: Malachite green (basic)

Negative Stain

Colorless organisms against dark background.
Primary dye: India ink (acidic)

Capsule Stain

Spore Stain



Gram Stains

A: Gram negative rod
B: Gram positive coccus
C: Gram positive rod