Where does this color come from? Here's where understanding how an egg comes to be is important. Chicken yolks, or ova, form in the chicken's ovaries. A fully formed ovum will leave the ovary and be deposited into the oviduct. This part of the chicken's reproductive system has five distinct sequential segments which the yolk passes through on its way to the outside world, but it's the fourth one — the shell gland — that affects the color of the egg. This is where the shell forms around the ovum.

这些颜色是怎么来的？这就要从鸡蛋的形成过程说起了。母鸡的卵巢里会首先孕育出蛋黄（也就是卵子）。成熟的卵子会离开卵巢来到输卵管。在输卵管中，卵子会按顺序经过五个部分，然后才到达体外；其中第四个部分是卵壳腺，蛋壳就是在这里形成的，这个部分影响了鸡蛋的颜色。

"The shell of all chicken eggs are made of calcium carbonate, a crystal that is white in color," says Fowler. "So all eggs are, at least at the start, white. Any that we then see that are other colors have had a pigment deposited on them as they were moving through the oviduct, after the white egg shell had been deposited. You can see this if you open up a brown egg and look at the inside of the shell, it'll be white."

福勒称，“所有蛋壳都是由碳酸钙组成的，碳酸钙是一种白色晶体。所以所有鸡蛋至少最初都是白色的。有色的蛋壳都是在经过输卵管时被染了色。不信你可以敲开一个褐色的鸡蛋，看看蛋壳内部的颜色，那一定是白色的。”

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