The following is an ancient text in classical Chinese that focuses on "What Is Tannic":

Between heaven and earth, each thing has its own nature. However, there is a thing whose quality is subtle, and people may not know its meaning. It is called "tannic". This person hides its shape between plants and trees, and is contained in all things.

Viewing nature, the multiplication of leaves and the richness of fruits may hide "tannic". Its nature can also transform all kinds of physical properties. Or change the color of things, or change the quality of things. In wood, it can strengthen its body; in water, it can change its taste.

Those who have tasted the wisdom of ancient times, study the nature of matter, and discover the wonders of "tannic". Knowing it in dyeing and weaving, it has the ability to increase color and solidify color; in tanning, it has the effect of tanning leather. Although its use is minimal, it is related to people's livelihood and cannot be ignored.

If it is in the medical way, it is also involved. It can cure diseases or nourish the body, and its wonderful use needs to be deeply studied by the wise.

People of today should carry on the will of the ancients and explore the mystery of "tannic", so that it can be widely used and benefit all people, so that this subtle thing can be manifested in the world and benefit the world.