While Lili preserved eggs are spreading all over the world, they are also constantly developing. In the 1920s, Jin Zaixing, a town resident, opened a pickled egg shop called "Jiuchang". There were two types of preserved eggs produced, "Hucai" and "Jingcai", especially the latter which was more distinctive. . "Jingcai" Songhua Egg is also called "Tender Preserved Egg". When making, soak the selected duck eggs in water prepared with alkali, salt, tea leaves, mulberry ash, gold powder, etc., pick them up after about 20 days, mix them with dry mud powder and mix them with brine, wrap them up, and then roll them in rice cakes. The chaff is ready. After the egg is peeled, it is covered with patterns. After being cut, it is divided into three rings of different colors. The outer ring is black and forms a crystalline hard lump. The middle ring is slightly yellow and soft. The inner ring is golden yellow and is like molten sugar. It is called For "sugar heart eggs". This kind of preserved egg not only has a good color, but is also refreshing, cool, non-astringent and non-spicy. It is a delicacy that can be enjoyed with wine or porridge. It is sold well in the surrounding Jiangsu, Zhejiang and Shanghai, and is also exported to Southeast Asia.

To this day, Tanghua Village, Heilong Village, Youyi Village and other places in the Basi Community of Songling Town, which are quite close to Lili Ancient Town, still retain the tradition of producing preserved eggs. There are many lakes in this area, and it has a tradition of raising waterfowl and processing eggs, which has a history of nearly a hundred years. In recent years, the introduction of new technologies and new processes has injected new vitality into old industries. Its representative inheritors include Zhang Kunlong from Tanghua Village, Wu Guiyuan and Zhang Guohua from Heilong Village, and Yang Yuanlong from Youyi Village.

The number of egg processing households in these villages (including Songling Town Poultry and Egg Market) reached 268. In 2006, more than 300 million preserved eggs were processed and sold to Jiangsu, Anhui, Shanxi, Shandong, Inner Mongolia, and Northeast China. Three provinces and other parts of the country. There are 6 registered trademarks for its eggs, including Black Cat, Yuxiang, Caidie, Hualin and Dianshan Lake.