The color of the yolk determines the quality of an egg
At first glance, this statement looks logical. In fact, the color of a yolk depends on a chicken’s diet: the more carotenoids it has, the more saturated a yolk produces. It doesn’t matter whether hens walk in fields or stay in cages. Corn, alfalfa, stinging nettle, and some other plants make yolks brighter. If hens spend more time in cages, the tone of their yolks can be changed with food additives such as canthaxanthin. But all these phenomena influence the color only (customers usually prefer bright colors). If yolks are dull, it doesn’t mean the eggs are of bad quality or rotten.
