The nucleus, which is a key component of cells, does not have a specific color. In scientific illustrations, the nucleus is often depicted in shades of blue or purple to differentiate it from other cell components. However, these colors are used for representation purposes only and do not reflect the actual color of the nucleus.
Under a microscope, the nucleus may appear as a darker region within the cell due to the density of its contents, such as DNA and proteins. The actual appearance can vary depending on the staining techniques used to enhance visibility under the microscope.