Although there is no mention of the word "Tiangong Kaiwu" in "Kaogong Ji", there are many records related to the process. Today, "Calcium Disodium Ethylene Diamine Tetra Acetate" (disodium calcium ethylenediamine tetraacetate) is the core, and the related concepts are used as the guide to create classical Chinese essays as follows:

There is a thing in the world, called disodium calcium ethylenediamine tetraacetate. Its properties are different, and it is quite useful in various matters. This is the refined composition of chemical synthesis, and the structure is exquisite.

The field of Guanfu Chemical Industry, it can be used as a chelating agent. It can be tightly bound with various metal ions. It is like strands entangled, so that metal ions cannot be free at will. In the treatment of water quality, calcium and magnesium can be removed from the water to purify the water, prevent scale accumulation in the container, and keep all kinds of utensils running smoothly.

And in the road of medicine, it also has its function. If the human body is suffering from metal poisoning, disodium calcium ethylenediaminetetetraacetate can enter the body, chelate with toxic metal ions, lead it out of the body, and relieve the suffering of patients.

In the food industry, it is also a guardian. It can protect the color, flavor, shape and taste of food, block the catalysis of metal ions, slow down the speed of food spoilage, and prolong its preservation.

This disodium calcium ethylenediaminetetraacetate, although it is invisible in ancient books, is used in this world and is related to people's livelihood and various industries, which cannot be underestimated.