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The nucleus in a living cell is almost completely transparent. This is a good thing, since the lens of the eye is covered with a layer of cells that keep it healthy! The colors we see in animals and people are the result of naturally occurring pigments made inside the cells (but outside the nucleus).

We use dyes and stains to see the different structures in a cell. The most common dye for the nucleus is hematoxylin. It shows up as a purple-blue color. That's probably the reason why most illustrations of cells have a purple nuclei. (Do a Google image search for the word 'cell' to see what I mean.)

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11y ago

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