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.
鸡蛋应该放冰箱里还是常温储存?这取决于你生活在哪个国家。澳大利亚、日本和美国等一些国家要求用于销售的鸡蛋必须经过清洗。清洗程序能够清除沙门氏菌,但同时也洗去了蛋壳上防御微生物的蜡状保护层,所以需要放冰箱里面。
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