Qingsong brand is a famous local brand, founded in 1936, the production of Songhua eggs has strong regional characteristics. Yiyang Songhua Preserved Egg is a famous dish of the Han nationality in Yiyang, Hunan Province, with a long history. In 1981, it won the national silver medal at the national food quality appraisal and was sold to dozens of countries and regions such as Europe, America, Japan, and Southeast Asia. The preserved eggs are brown or greenish-brown, soft and translucent, non-touching, elastic, tortoiseshell cortex, embedded with milky white pine branches. The taste is delicious, refreshing and refreshing, and it is not greasy to eat. However, in 2013, it was found that a certain batch of products was unqualified. The price of a green pine preserved egg is generally more than two yuan.