How can cells of different living organisms be colored in different colors (give at least three different examples)?

A cage can be colored for several reasons. The first reason is the presence of pigment in the cell itself. For example: in plant cells there is a pigment – chlorophyll, which stains the cell green. In animals, it is a pigment called melanin. It gives color to skin, hair, iris. The second reason for the staining of the cell is the ingress of the dye into the cell with food. The cell itself can absorb pigments. The third reason is external coloration. For example, cells are stained with iodine for better viewing under a microscope.