Basic stains are positively charged stains that color negatively charged molecules and cells like bacteria and nucleic acids, making the colored cells contrast a bright background. 

Basic Stains

Simple stains make all of the organisms in a sample appear to be one color through use of a positively charged dye. Some examples include: Crystal Violet, Methylene Blue, and Safranin.

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Methods of preparation to allow us to view and distinguish different cells and their structures that were otherwise translucent through the use of ionic salts in stains/dyes. 

Staining 

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Simple Stains

Differential staining utilizes multiple different dyes to allow us to distinguish between different types of organisms. 

Differential Stains

Acidic stains are negatively charged stains that repel negatively charged cells or attract positively charged structures. Some examples include: Nigrosin and Congo Red.

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