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Neither of the current answers fully answer the question. The amount of liquid underneath a coverslip should be just sufficient to hold the coverslip and sample onto the slide. If there is too much water, the surface tension would become reduced, allowing the coverslip to fall off the slide. Additionally, minimising the amount of water between the ...


Well, from personal experience, whenever there was excess solution on the glass slide, our teacher always commented that our slides were messy. So I guess the entire idea is to keep the slide neat, clean and to make it look presentable for observation. Also, in case the excess solution flows out to the entire surface of the glass slide, the stage clips may ...


If I understood the question, it's just because otherwise the solution would flow out and stain the microscope.

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