1, wash the duck eggs and wait for use.

2, the soda ash and salt into a small porcelain jar, rushed into the boiling water, to be fully dissolved, and then added in batches of quicklime and firewood ash, when the quicklime all "melted" open, the material ash on the preparation of a good, you can also buy directly to change the egg powder.

3, the material ash (can add some rice husk or wheat bran) or egg powder evenly coated in fresh eggs.

4, spring and fall sealed storage for about 25 days, summer about 15 days, winter about 30 is good.

Sponge eggs, also known as leather eggs, changed eggs, colored eggs, etc., named for the pattern on the eggshell, mellow flavor, is a traditional Chinese flavor egg products. Made eggs, eggshell easy to peel, egg white coagulation, light green-brown or tea-colored translucent jelly-like, in the tea-colored egg white in the pine-needle white crystals or patterns, the yolk was semi-coagulated, the yolk can be clearly divided into dark green, earthy yellow, gray-green, orange and other different colors, yolks in the heart of the soup.