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What you are asking about is probably just the chemical stains added to the slide to help make things visible. Most structures in cells are just transparent and barely visible without this artificial staining. Different colored stains attach better to different cellular structures, thus helping to identify them.

One of the few cellular structures that is naturally colored and thus easy to see without staining are chloroplasts, which are a bright green from the chlorophyll they contain.

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10y ago

What else can I help you with?