Interestingly, the light of the sun can fade the color of an egg’s shell, even before it has been laid. This is a phenomenon that especially affects free-range chickens in hotter climates. “Although shell color is mainly determined by genetics, the effect of strong sun and high temperatures on the hens can produce a fading effect on the shells. Why too much sun affects the surface pigmentation in this way is unknown, but it can be a problem for those who sell such eggs,” Thear says. She notes that stress, premature laying, changes in diet, bullying, viral infections, and the presence of predators can also lead to eggs with pale colors.

So, that's what produce's "brown eggs"

What color earlobes does the hen half to have to lay the golden eggs? 24k ones! lol