Photographs: The use of fluorescent lamps to look after, this is the best way to identify. When a good egg looks bright, the egg is completely translucent, orange-red or light-orange, and the eggshell has no spots. If it is black, it is a rotten egg; if it is a cloud, it is a yellow egg; if it has a dark shadow, it may be a white egg (no eggs that have been fertilized for 2 or 3 days): if there is bloodshot or blood clot Eggs (unfertilized eggs hatched for about 10 days)
Look: Good egg shell has a sense of freshness, there is a layer of white cream: head shines white shell shell, large stomata; mildew shell gray black spots; rotten egg shell Ukraine.
Hey: The fresh egg is sinking in her hand and it feels pressured. On the contrary, it is not a fresh egg.
Listen: Listen to the sound in the egg. Hold the egg with two fingers and shake it close to the ear. The sound made by the good egg is real. The empty, big, hollow sound. The stinking egg and the sticky egg are like knocking on the rubble.
Put the egg into the water, sinking, pointed down for good eggs; otherwise, it is not very good or bad eggs. When pickling eggs, the eggs can be immersed in 10% salt water. The fresh eggs sink; the eggs float slightly; the bad eggs float out of the salt water surface.
Source Health Knowledge Network