2. The difference between preserved eggs and preserved eggs lies in the different materials. Preserved eggs are made of lime, while preserved eggs are made in plant ash. Preserved eggs also have many names, such as "preserved eggs", "gray-wrapped eggs" and "wrapped eggs". They are a kind of egg processed food developed by Han people in China. People use special processing technology to make the surface of eggs dark and smooth, and many pine-like lines can be seen, which has a unique and pleasant fragrance, soft entrance and endless aftertaste.