"Tiangong Kaiwu" says: "The four-rose tallow, its tree is very tall, and its leaves are different from other tallow." The four-rose tallow has a wide range of uses.
The first is for oil. The seed of the four-rose tallow, which can extract oil. Its oil has various uses. When there was no electric light in the past, it was used to burn lamps. Although the light is not as bright as it is today, it can also break the darkness a little in the dark, illuminating people, so that people can do things at night, or read and write, or manage housework. In industrial production, this oil can be used as a raw material, participating in the manufacture of many products, such as the preparation of certain paints, and its characteristics can be used to increase the quality of paints.
The second is the way of wood. The wood of Sapium sapium is made of solid material and fine texture. It can be used for construction, such as building beams, supporting the structure of the house, and supporting the weight of the house with its solid quality, so that the occupants can be stable. It can also be made for furniture, made into tables, chairs, beds, etc. Because of the fine texture, it has been carved and polished by craftsmen, and the finished product is beautiful and durable, which can add elegance to the room.
In addition, its leaves also have wonderful uses. In autumn, the leaves are colorful, or red or yellow, which is quite ornamental. They can be planted in gardens, contrasted with pavilions, rockeries, and ponds, creating a unique landscape for people to enjoy and make people feel relaxed. And the leaves can be treated, or can be used as medicine, although the effect is not as significant as that of other precious medicinal materials, it may have auxiliary healing power for some common diseases.
In summary, Sisei Sapium is a treasure, used in lighting, industry, architecture, ornamental, medicinal and many other aspects, and is an indispensable tree in the world.

In "Tiangong Kaiwu", the quality of the four-rose alum has a number of characteristics. The color of the four-rose alum is often crystal clear, or white with a light yellow luster. It is warm and shiny when viewed. This is the quality of its appearance. Its touch, if you twist it with your finger, feels delicate and smooth, without the feeling of rough and stinging.
On its chemistry, the four-rose alum is calcined in the fire, and it has a wonderful change. In case of high temperature, it gradually melts and precipitates water vapor, and the water vapor rises like fog. After melting, the color and quality are different from before, or it is slightly yellow or even reddish, and the texture is also hard.
As for its solubility, in water, tetrasase alum is soluble, but the speed of dissolution is not overnight. It is initially placed in water and gradually disperses, and the water gradually becomes clear. If stirred, the dissolution rate is slightly increased. And its aqueous solution has some special properties. If you try it on a test paper, it may be weakly acidic, which is the manifestation of its ionic state after dissolving in water.
In addition, tetrasase alum is mixed with other substances, and it also changes differently. When it encounters alkalis, it often reacts, or precipitates. The color and shape of the precipitation vary depending on the base, or white or gray, or flocculent or granular. These various physical properties are the characteristics of the four-rose alum, which are of great use in the ancient chemical industry, printing and dyeing, etc. Craftsmen make good use of them according to their nature to achieve all things.

The chemical properties of tin tetrachloride are quite stable. Tin tetrachloride, a colorless fuming liquid at room temperature, has a strong pungent odor. In the air, it is easy to interact with water vapor to form a hydrochloric acid mist.
When it comes to stability, tin tetrachloride can maintain a relatively stable state under normal conditions. In an anhydrous environment, its chemical activity is low, and it is not easy to spontaneously react with many substances. However, when exposed to water, its stability is greatly affected.
Tin tetrachloride is prone to hydrolysis. When it encounters water, it reacts rapidly to form tin acid and hydrochloric acid. This hydrolysis reaction is quite violent and releases a lot of heat. This property shows that tin tetrachloride is difficult to maintain stability in humid environments.
In addition, tin tetrachloride can be used as a Lewis acid to react with solitary electrons to form coordination compounds. This reaction also reveals that tin tetrachloride will exhibit certain chemical activity in a specific chemical environment.
In summary, the stability of tin tetrachloride depends on the environment. When there is no water and no specific reactants, it is relatively stable; but when exposed to water or specific reaction reagents, its chemical properties are active and its stability is lost. Therefore, when storing and using tin tetrachloride, it is necessary to fully consider its sensitivity to environmental factors to ensure the safety of operation and the accuracy of experimental results.

"Tiangong Kaiwu" contains the article, the art of making porcelain has been around for a long time, and the four kilns are all good at their own strengths. There are also many wonderful methods for making the billet of the Four Sheep Zuns.
First, the selection of materials is the key. It is necessary to take the soil of Gaoling. This soil is pure, delicate and warm, and is a good foundation for porcelain. The soil must go through various processes of pounding and washing to remove its impurities and make it uniform. For example, "Tiangong Kaiwu" says: "The soil comes out of Wuyuan, Qimen and the two mountains... wash away the stones, and then hit and practice to reconcile." After this, the delicate billet soil is obtained, which is the beginning of the formation of the tool.
Second, the billet forming is a delicate skill. The craftsman uses both hands and the billet wheel to shape the mud ball into the shape of Zun by the force of rotation. The weight of the hand and the speed of the speed are all related to the shape of the blank body. The belly, neck and feet of Zun are all gradually taking shape in the palm of the craftsman. As the book says, the work of billet drawing is "as thin as dust, and as clever as Fan Jin", which shows the exquisite skills.
Third, the billet trimming cannot be ignored. The billet body is just formed, and the surface may be uneven. It needs to be carefully trimmed with tools such as bamboo knives and stones. Make the lines of Zun smooth and the surface smooth. This step aims to remove its flaws and achieve perfection.
Fourth, the method of decoration can add color to the blank body. Or engraving, using knives to engrave patterns on the blank body, the line depth is consistent, lifelike; or printing, using molds to print patterns, clear and regular. The sheep pattern decoration of the Four Sheep Zuns must be carefully designed and carved by skilled craftsmen, so as to show simplicity and solemnity.
The method of making billets is interlocking, and it all depends on the heart and hand of the craftsman to create such exquisite utensils as the Four Sheep Zuns, which will be passed down through the ages and admired by future generations.

The Siyang Zun was cast early in the late Yin and Shang Dynasties. It is the largest bronze square zun in the Shang Dynasty in China. There are many points to pay attention to in preservation and transportation:
First, when preserving, we must pay attention to environmental factors. The material of this zun is bronze, which is susceptible to rust and corrosion due to humidity and temperature. Therefore, the storage place should be kept dry, the humidity should be controlled at 40% - 50%, and the temperature should be 15-25 ° C. This can slow down the oxidation rate of bronze, prevent harmful rust formation, and avoid irreversible damage to utensils.
Second, avoid vibration and collision. The Siyang Zun has a unique shape, with slender and prominent sheep heads and horns, which are extremely fragile. When storing, it should be placed in a stable place, and protective devices should be arranged around to prevent damage caused by accidental collision. During the handling process, it should be handled with care, and it should be wrapped with professional packaging materials, such as foam and sponge, to ensure that it will not be damaged during transportation vibration.
Third, prevent direct light. Long-term direct light will accelerate the aging of utensils and have adverse effects on their surface color and texture. Soft lighting should be used in storage places to avoid direct sunlight, and low-illumination and UV-free lighting equipment should also be used during exhibitions.
Fourth, professional planning is required for transportation. Special transportation boxes should be customized according to the size and weight of the four sheep statues, and buffering materials should be filled inside. During the transportation process, choose a smooth transportation method, control the speed, and avoid sudden braking and sharp turns. At the same time, transportation personnel should have professional knowledge and know the key points of cultural relics protection to ensure the safety of the Four Sheep Zun during transportation.