Henan change egg production method is lime, water, edible alkali mixed into a paste mixture in the ratio of 1:2.5:0.18. The eggs are completely submerged in the mixture and fished out, placed on the sawdust and rolled, so that the outermost surface is covered with sawdust. Then put all the eggs together into a plastic bucket, close the bucket completely, and keep it at room temperature for about 7 days (the closed storage time is adjusted with the room temperature) and then you can eat it.
The raw materials needed for the production of Henan egg-altering eggs are fresh eggs, quicklime, drinking water, sawdust (or wheat bran), and sometimes a small amount of salt, pepper, spices and so on are added to improve the taste, and the whole process of production of Henan egg-altering eggs doesn't use lead-containing materials, and therefore it is a lead-free egg-altering egg.
Expanded Information:
The hazards and preventions of egg changes
1. Eggs contain lead, which many people know, so people buy lead-free eggs thinking that they can eat them without worry. In fact, lead-free eggs also contain lead, adults can, for children or eat less good.
2, the processing of eggs, soda ash, lime, salt, yellow Dan powder mixed in a certain proportion, plus mud and chaff wrapped in duck eggs outside, two weeks later, delicious eggs are made. Huangdan powder is lead oxide, has the effect of making the egg produce beautiful patterns, but with Huangdan powder, the egg will be contaminated with lead.
3, according to the study of national regulations, per 1000 grams of egg lead content shall not exceed 3 mg, in line with this standard of the egg is also called lead-free egg. Therefore, "lead-free eggs" does not mean that no lead, but refers to the lead content is lower than the national standard.
Baidu Encyclopedia - Eggs