Eating zongzi on Dragon Boat Festival is because of Qu Yuan, but why eat salted eggs? What's the history?

Dragon Boat Festival is also a rain festival and a farmers' day. As the saying goes, "You must eat salted eggs first, jiaozi." Dragon Boat Festival indicates that the hot summer is coming, and the life activities of animals and plants have entered a peak stage. Farmers speculate on the rainfall in the second half of the year according to the performance of the rain and solar terms of the Dragon Boat Festival, and adjust the farming in the second half of the year in time. In the agricultural proverb "It rains on the first day, boating on the fifth day, sharpening the knives on the thirteenth day, washing the streets on the seventeenth day and washing clothes on the eighteenth day (it will rain)", the agricultural proverb "It doesn't rain on the eighth day (the eighth day of May), and it doesn't rain on the eighth day of May" means that if it doesn't rain on the eighth day, more than 18% people will plant mung beans.

In Nanchang, Jiangxi, besides eating zongzi, tea eggs and salted eggs are also cooked during the Dragon Boat Festival. Eggs are divided into eggs, duck eggs and goose eggs. The eggshell is painted red, wrapped in colorful net bags and hung around the child's neck, which means wishing the child "good luck and peace".