鸡蛋有红皮、白皮、绿皮，有什么区别？_时事

鸡蛋有红皮、白皮、绿皮，有什么区别？

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。”

Two pigments are responsible for the spectrum of chicken egg color. Shades of greens and blues are caused by the pigment biliverdin, while protoporphyrin is responsible for reddish-brown hues.

决定鸡蛋颜色的主要有两种色素。胆绿素会让鸡蛋变成蓝色或绿色，而原卟啉则会把鸡蛋染成红褐色。

The same egg-coloring process holds true for all birds with colorful eggs. American robin (Turdus migratorius) eggs, for instance, are famously blue. The pear-shaped eggs of a common murre (Uria aalge) can sport a blue hue, be speckled or feature brown streaks.

其它鸟类的蛋壳颜色也是一样的道理。例如，众所周知，美洲知更鸟下的蛋就是蓝色的，而崖海鸦的梨形蛋不仅是蓝色的，通常还带有斑点或褐色条纹。

****小知识****

Should chicken eggs be kept refrigerated or at room temperature? It depends on whether you live in a country (Australia, Japan and the United States, for instance) that requires eggs produced for commercial sale be washed. This process protects against salmonella, but also removes a waxy shell coating that naturally defends eggs against microorganisms, thereby necessitating refrigeration.