Here we can see the chromosomes that gather around the equator of the cell which is found between the two centrosome poles. This equator of the cell is called the metaphase plate or the equatorial plate. Only after everything has happened that needs to happen at this phase is when the cell goes into anaphase.
The outside only looks pigmented because of the color reflecting off it, but the inside is white and unpigmented because it is reflecting all the colors. Does this help?