All longan meat will oxidize and become a little black when exposed to air for a long time. If it is not moldy and rotten, it should still be edible. Generally speaking, Gaozhou corn meat is small, thin and easy to dry, so it will last longer than other varieties. Generally speaking, dried longan meat can be preserved for one or two years at room temperature, but in order to prevent parents from eating deteriorated longan meat, it is recommended to refrigerate longan meat and eat it within one year.

Fresh longan meat is rich in water. Longan meat itself has a high sugar content, and it turns a little black after drying, also because it is rich in glucose, sucrose and protein. The water evaporated, leaving only sugar.