The Gram stain is an example of a stain, because the process uses two contrasting stains to separate bacteria into groups based on cell wall composition.

differential stain

Explanation:

Differential stain -

It refers to the process of staining , which comprises of more than one chemical stain , is referred to as differential staining .

Multiple stains enables better differentiation between the microorganisms .

Gram stain is also an example of differential stain , as it uses two stains for testing process .

Hence , from the given information of the question ,

The correct answer is differential stain .

helicase, i think thats it

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