Why does the duck egg white turn green?

When eating duck eggs, especially salted duck eggs, when you open the duck eggs, you will find that the egg white has turned a little green. The main reason for this phenomenon is that the duck eggs have been stored for too long. Try to eat less of such duck eggs. Although they can be eaten, they must be cooked. When buying duck eggs, you should learn some selection skills to avoid storing the duck eggs for too long, as the nutritional benefits of such duck eggs will also deteriorate.

Why does the duck egg white turn green?

In this case, the eggs are in the process of spoiling, but they can still be eaten and must be cooked. Generally, the shelf life of eggs varies during the storage process due to changes in ambient temperature. The shelf life is shorter in summer, so don’t buy too many eggs and try to eat them as quickly as possible. However, sometimes they are inevitably green when you just buy them. That’s because the eggs have been with the seller for too long.

Buy ones with a clean and unbroken surface so that bacteria can't easily get in and turn green. Don’t eat it if it’s too green. I often encounter eggs like this and I deal with them this way. Also, don’t eat it if the color is too dark. This means that the egg has gone bad and been infected by bacteria. The green color inside is produced by the massive growth of a bacteria called Gippsland, and the color of the bacteria cultured in the culture dish is also green. These eggs are not edible. Please keep the eggs you buy fresh.

3 tips for choosing fresh duck eggs

1. Look at the color

When buying duck eggs, first consider the green shells, and the eggshells should be smooth, clean, intact and undamaged. If the shell of the duck egg is white and feels rough, or the shell feels very thin, it is probably because the duck that laid the egg is not strong enough, and such duck eggs are not easy to store. In addition, you can also pick up the duck eggs and shake them. If the quality is good, you can feel the egg shaking slightly inside.

2. Listen to the sound

The duck eggs commonly known as "iron sound" by insiders have no pores and a very smooth surface. A slight, sharp sound will be made when you flick them with your fingers or gently knock two duck eggs together. Such eggs are very rare and are fine for eating, but not for making preserved eggs or pickled salted eggs. The reason is that duck eggs without pores will still be fresh eggs after being pickled for a month.

3. Distinguish true from false

There are several ways to identify fake "duck eggs": the color of the eggshells of fake chicken and duck eggs is brighter than that of real eggs, but not too obvious; when you touch the shells of fake eggs with your hands, they feel rougher than real eggs; there will be a sound when you shake a fake egg; and soon after a fake egg is opened, the yolk and egg white will melt together.