Paper ash can be used as fertilizer. Paper is made of wood, and wood ash can be used as fertilizer.

There are few historical records about the ancient papermaking methods in China, but the papermaking technology and its principle have not changed much since it was invented two thousand years ago. To sum up, the following points can be summarized:

First, cut plants, such as hemp plants, are soaked in water, peeled, chopped with a knife, boiled in a pot, soaked and trampled after cooling, and stirred with a stick to make their fibers break and thin.

Secondly, add auxiliary materials to make paper pulp.

Thirdly, it can be dried by a paper machine (bamboo curtain and the like) to make paper.