After picking, Li Kai must clean the leaves carefully. "A leaf is definitely not something you can use directly." He said that after washing, it must be soaked, flattened, dried and other processes. Soaking is not as simple as it sounds. "How long it took to soak, to what extent it was the most sculpted, and it was just this that I figured out in about a month."

It usually takes a long time to put the leaves in the book and dry them. "It usually takes more than 10 days for the drier ones and a month or two for the green leaves," Li Kai said. This is a job that requires patience and even the preparation work will take a long time.