1. Difference of raw materials: preserved eggs are mainly made by pickling eggs, while preserved eggs generally refer to preserved eggs, which are mainly made by pickling duck eggs, which is the essential difference between the two.

　　2. Appearance difference: after the egg is shelled, the protein is yellowish or transparent, and the yolk is yellow and black, while after the preserved egg is shelled, the protein is black, the surface is decorated with pine flowers, and the yolk is black.

　　3, taste difference: the taste of changed eggs is more q-elastic. The entrance is firm and fresh, while the taste of preserved eggs is slightly soft and slightly fishy.

　　4. Odor difference: The preserved eggs smell fragrant and attractive, while the preserved eggs smell foul, which is caused by alkali odor and hydrogen sulfide gas generated by the reaction.

　　5, taste difference: the taste of preserved eggs is a little salty, the entrance is fresh and fragrant, and the yolk is also salty, while the taste of preserved eggs is mainly alkaline odor, and both the yolk and the protein entrance are very salty.