2. The second method is to open a round hole at the bottom of the bamboo pen container, which can prevent it from cracking due to thermal expansion and cold contraction.
3. Also, boiling bamboo with water can also prevent cracking and moth-eating.
It is also a good idea to bake with fire, which can speed up the drying of bamboo and prevent it from cracking in later years.
5. The reason of bamboo cracking is that the ratio of thermal expansion to cold contraction of bamboo skin and bamboo inner bag is different. You can chisel away the tender part of the bamboo inner sac with a chisel, so that the treated bamboo will not crack easily.