Hunan Yiyang is the birthplace of the pine egg, according to historical records from the early Ming Dynasty to now has a history of more than 500 years. Yuanzhou District, Yichun City, Jiangxi Province, is an important place of origin of loose-flower eggs, while the loose-flower eggs of Nanchong, Sichuan Province, are more unique, and the loose-flower eggs of Songtao, Guizhou Province, originated in the Xia Dynasty.

Songhua eggs: also known as skin eggs, changed eggs, gray eggs, etc., is a traditional Chinese flavor egg products. The main raw material is duck eggs, smooth and refreshing taste, color and flavor are unique. Songhua eggs are not only loved by domestic consumers, but also enjoy a good reputation in the international market. After a special processing method, pine eggs will become dark and shiny, with white patterns on top, and a special aroma when smelling, which is one of the favorite delicacies of the people.