When I first got him/her the cere had light blue on the outside with a sort of pinkish peach in the center. Then, the outer corners of the cere turned a very pale blue and the closer you got to the middle, the darker it became (his/her cere was always a paleish blue, never "electric blue". Now it's getting the weird brown spots but the edges are still so light blue it's practically white.

That's the clearest picture I have of his cere before the brown spot.