Why Are Eggs White Heres What Determines Their color

Eggs are an excellent source of protein and other nutrients. They are also a popular breakfast food around the world. Eggs are a versatile ingredient that can be used in cooking, baking, and even making cosmetics.

Eggs contain high-quality proteins, vitamins, minerals, fats, and antioxidants. They are also a rich source of choline, which helps improve brain function.

Eggs are an essential part of any healthy diet. They provide protein, vitamins, minerals, and other nutrients that our bodies need to function properly. However, there is one thing that you might not know about eggs – their color.

Most people think that eggs are white because they are laid by chickens. In fact, egg yolks are actually yellow. The reason that they appear white is that the whites are covered in a thin layer of albumen. Albumen is a clear liquid that protects the eggshell.

If you want to learn more about the science behind egg colors, keep reading.

Why are eggs white?

The first question most people have when it comes to eggs is why do we see them as being white instead of brown or black? It turns out that this isn’t just something that happens with chicken eggs; all types of birds lay eggs that look like those from hens.

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Eggs are white because they come from animals whose blood contains hemoglobin. Hemoglobin gives the red pigment found on animal skin and meat its characteristic appearance. When these pigments mix together, they create what appears to be a solid white substance.

When the hen lays her egg, she secretes some fluid into the shell. This causes the albumen inside the egg to expand slightly. As the albumen expands, it pushes against the air trapped between the two halves of the shell. This creates pressure within the egg, causing the outer membrane to separate from the inner membrane.

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This process takes place over time, so if you buy your eggs at the store, they will likely still be attached to each other. If you crack open the shells yourself, however, you should find that the membranes are already separated.

How does the shell get its color?

When a hen lays her egg, she covers it with a protective membrane called the cuticle. This membrane has pores through which air enters the egg. As time passes, carbon dioxide builds up inside the egg. When enough gas accumulates, the pressure causes the membranes to rupture.

White eggs vs brown eggs: Which is healthier? - Times of India

This process creates holes on both sides of the egg. These holes allow oxygen to enter the egg while preventing bacteria from entering. Oxygen allows the egg to turn blue due to oxidation. Carbon dioxide prevents the egg from turning green.

Once the egg becomes sufficiently oxidized, the pigment melanin begins to accumulate within the egg. Melanin gives the egg its characteristic dark appearance.

What makes the egg white opaque?

As mentioned above, the albumen covering the egg contains pigments such as carotene and xanthophyll. Carotene produces orange hues, whereas xanthophyll produces red tones. Both pigments absorb light waves of certain wavelengths.

These wavelengths fall between 400 nm and 700 nm. Light rays below 400 nm cannot penetrate the thick layers of albumen. Therefore, only the outermost parts of the egg become visible. On top of that, the thickness of the albumen varies depending on where the egg was incubated. If the egg was kept warm during development, then the albumen will be thicker than if the egg was left outside.

Finally, the amount of water present in the egg affects the opacity of the albumen. Water absorbs light waves longer than 1 micron. That means that the less moisture there is in the egg, the whiter it appears.

People used to think the feather colors dictate the egg color

In fact, many people believe that the reason for an egg’s color depends upon whether the bird laid the egg before or after molting. The idea behind this belief is that chickens who had their feathers removed prior to laying would produce darker-colored eggs.

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However, research shows that this theory doesn’t hold true. In one study, researchers compared the yolks of eggs produced by hens that were allowed to grow new feathers versus those that weren’t. They found no difference in the yellowness of these eggs.

The same thing happened when scientists looked at the whites of eggs. Again, they didn’t see any differences in whiteness based on how long the birds’ feathers grew out.

There is a chicken earlobe theory

Some people have suggested that the reason why some eggs appear lighter colored than others might depend upon the size of the chicken’s ears. It seems logical because larger animals tend to have bigger lobes. However, studies show that this isn’t necessarily the case. For example, cows don’t seem to affect the color of their milk.

Chicken Earlobe Theory is a term used to describe the belief that chickens have ears that are located on their heads. This theory was created by scientists who believed that chickens had ears on their heads because they could hear better from there. The truth is that chickens actually have ears on their feet!

In the end, it’s all down to chicken breed

Egg color can vary greatly among different breeds of chickens. Some breeds lay brownish eggs with yellow spots; other breeds lay pale yellow eggs without any markings. There are even breeds that lay black eggs.

Breeds also differ in terms of what determines their color. Brown eggs come from chickens whose parents are heterozygous recessive carriers. Yellow eggs result from homozygotes carrying dominant alleles. And white eggs occur when both parents carry recessive alleles.

So, while you may not know which type of egg your hen lays, you do know that she has inherited her genes from her mother and father. So, next time you buy eggs, remember: You’re buying them from someone else’s family tree.

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Brown eggs were meant as camouflage

When we look back into history, we find that brown eggs were once considered more valuable than white ones. Back in ancient times, farmers needed to protect themselves against predators like wolves and bears. To avoid being eaten, they painted their livestock with mud so that the predator couldn’t tell what kind of animal it was eating.

This practice continued until about 300 years ago. At that point, farmers realized that painting their livestock made them easier targets. As such, they began using white eggs instead. Today, most people still prefer white eggs over brown ones. But if you want to get the best price for your eggs, make sure you ask your farmer to sell you only brown ones.

There is no nutritional difference between white and brown eggs

While many people believe that brown eggs contain more nutrients than white ones, this simply isn’t true. Both types of eggs provide similar amounts of protein, fat, cholesterol, vitamins A and E, iron, calcium, phosphorus, zinc, copper, selenium, riboflavin, niacin, and vitamin K.

Why do American eggs have white shells and British ones have brownish  shells? - Quora

If you really care about nutrition, then just eat whatever variety of eggs you’d like. Just be aware that the darker-colored eggs will cost you slightly more money at the store.


The fact remains that whether or not an egg is white or brown depends entirely on its genetic makeup. If you want to save yourself some cash, go ahead and purchase brown eggs whenever possible. They’ll taste great too!

I hope this post helped you with all your food curiosities.

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