This compound is called "***", and it can be traced in the art of alchemy and the study of the Compendium of Materia Medica.
I have tasted that in ancient times, alchemists refined alchemy and wanted the medicine of longevity. When all kinds of golden stones and plants were tried and fused, this compound occasionally appeared. Its nature is strange, or it has the ability to overcome various poisons and reconcile yin and yang.
Viewing "Shennong Materia Medica", although its name is not written directly, it may be used in the description of the return of various medicinal properties, flavors, and effects. To "Compendium of Materia Medica", Shi Zhen has widely collected it, and has studied various medicines throughout his life, or has detailed descriptions of their properties, origins, and processing methods.
This thing may be a unique medicinal introduction when a doctor treats a patient and saves a person; or in the eyes of an alchemist, it is the key to opening the door to immortality. Its color, its taste, and its quality were all carefully studied by the ancients. Those who are colored may change into a crimson yellow, such as the dawn and evening glow, looming the image of the interaction of yin and yang; those who taste may be Xin or sweet, Xin will diverge, and Gan will slow down, which is in line with the principle of the five elements of life; those who are qualitative, or as strong as gold or stone, or as soft as plaster, all vary with their environment and refining methods.
In the Taoist cultivation method, this thing may also play an important role. It is either to reconcile the help of inner qi when serving Qi and inedia; or to stabilize the needs of the soul when the spirit is refined. In the eyes of the ancients, it is not only an ordinary substance, but a spiritual object condensed by the spiritual energy of heaven and earth and produced by the symmetry of yin and yang. It carries the ancients' unremitting exploration of the mysteries of heaven and earth and the eternity of life.

The main physical properties of the compound are as follows:
Its color state is often crystal clear, like a beautiful jade made in heaven, pure and free of impurities, or a colorless and transparent body, under light, refracts a bright light, which is dazzling; or has a light and elegant color, like the beginning of the morning glow, giving people a soft and pleasing feeling.
Looking at its texture, it is delicate and warm. When the tentacles are touched, it is as if you can feel the essence contained in it, which is neither rough and sharp, nor too creamy and difficult to grasp. Just right, giving people a comfortable tactile experience.
As for its density, it has a unique value compared to ordinary things. When placed in water, it can sink or float, depending on its own density compared with water. The density characteristic is also an important basis for distinguishing this compound. Among various substances, it can be clearly distinguished by virtue of this characteristic.
When it comes to the melting point, a specific temperature needs to be reached before it can gradually melt from a solid state to a liquid state. This temperature is precise and harsh, like a unique code given by nature. When the temperature approaches the melting point, the compound gradually wakes up like a sleeping thing and begins to slowly change its form, from a solid state to a smart liquid. This process is wonderful and fascinating.
Boiling point is another key physical property. Under a specific pressure, when heated to this temperature, the compound will rapidly vaporize and transition from liquid to gaseous state. The whole process is accompanied by a drastic change in energy, resulting in the phenomenon of bubble tumbling and hot gas rising, marking a major change in the state of the compound.
Its solubility cannot be ignored. In some specific solvents, it can be rapidly dissolved and fused with the solvent to form a uniform and stable system; in other solvents, it is difficult to blend and maintain its own independent form. This property determines its existence and reactivity in different environments.

This compound has many common uses, which are related to people's livelihood and also involve the field of skills.
In people's livelihood, its uses are extensive. Such as the cooking stove, the fuel used, there is no lack of compound things involved. It helps to ignite the fire, making the fire strong and easy to cook, so as to nourish the belly of the people. If the room is warm and cold in winter, the compound can be used for heating, and when burned, it generates heat, drives away the cold air, makes the room warm like spring, and protects people from the pain of freezing.
As for skills, in the matter of smelting and casting, the compound is also crucial. Iron and copper need its help to adjust the heat and make the metal melt and shape. For example, in the art of forging swords, by combining things, the quality of the sword can be made tough and sharp, and it can become a sharp weapon for killing the enemy's defense. In the art of pottery, it can moisturize the clay and help it form, and it can be fired into utensils, or for food utensils, or for decorative products.
And in war, the combined things are also very useful. For example, the art of making fire and thunder, based on the combined things, can cause fire and hurt people. In the battle formation, its power is huge, and it can break through the enemy's camp and disrupt the enemy's formation. It can also be used as a smokescreen to cover the enemy's eyes, and one's own side can take the opportunity to act, or retreat or advance, to seize the opportunity.
And in the way of medicine, the compound can be used as a medicine guide or a medicine prescription. Its nature is different, and it can treat all kinds of diseases. Or it can detoxify, or it can relieve pain, or it can help the circulation of qi and blood, and it is a good help for doctors to cure and save people.
Furthermore, in the art of printing and dyeing, the compound can be used to make pigments, dye cloth and ready-to-wear, with bright colors and lasting durability, which enhances the color of clothing and enriches the life of the world.
It can be seen that the compound is widely used in the world, whether it is the needs of people's livelihood, or technical warfare, medical printing and dyeing, it is indispensable, and its contribution is great.

To make this thing, there are many ways. First, it can be made from natural materials and carefully carved. Choose high-quality raw materials, according to their shape and quality, with skilled skills, carve and grind, remove their flaws, and show their essence, and then become a good product.
Second, by the method of chemical synthesis. First study the chemical composition of this thing in detail, and accurately match various chemical raw materials. Under suitable temperature, pressure and other conditions, make it undergo chemical reactions. During this period, it is necessary to strictly control the reaction process, observe its changes, and adjust it in a timely manner to make the reaction smooth and the product pure, so as to obtain the desired thing.
Third, by the way of biosynthesis. Use the characteristics and functions of organisms, such as the metabolism of microorganisms. Screen specific microorganisms, provide their suitable growth environment, add specific substrates, and the microorganisms metabolize themselves to convert the substrates into the desired products. This process requires careful care for the growth of microorganisms to ensure a stable environment, so as to promote efficient synthesis.
Fourth, the method of mechanical manufacturing is also feasible. According to the design blueprint of this object, precision mechanical tools are used to cut, forge, and assemble each component. Using advanced numerical control technology to precisely control the operation of the machinery, the size of the components is accurate, and the assembly fits seamlessly, resulting in a complete object.
All these methods have their own advantages and disadvantages. The natural carving method can retain the natural beauty of the material, but it is time-consuming and laborious, and the yield is limited; chemical synthesis can precisely control the properties of the product, and the yield is high, but the technology and equipment requirements are strict; biosynthesis is green and environmentally friendly, and the conditions are mild, but the selection and cultivation of strains are more difficult; mechanical manufacturing is accurate and efficient, suitable for large-scale production, but the investment in equipment is quite huge. It is necessary to carefully choose the appropriate method according to actual needs, resources, costs and other factors to make a satisfactory product.

In chemical reactions, the common types of reactions of this compound are as follows:
One is a combination reaction. This is a reaction in which two or more substances combine to form a new substance. For example, hydrogen and oxygen ignite to form water, that is, $2H_ {2} + O_ {2}\ stackrel {ignited }{=\!=\!=} 2H_ {2} O $. In this process, different substances combine with each other to form a new compound. The combination reaction is often accompanied by a change in energy, or exothermic, or endothermic, and many substances combine to form a more complex material structure.
The second is a decomposition reaction. This reaction is the opposite of a combination reaction, in which a compound decomposes into two or more simpler substances. For example, calcium carbonate is calcined at high temperature to decompose into calcium oxide and carbon dioxide, that is, $CaCO_ {3}\ stackrel {high temperature }{=\!=\!=} CaO + CO_ {2}\ uparrow $. Decomposition reactions often require specific conditions, such as heating, electrification, etc., to promote the internal chemical bonds of the compound to break and decompose into other substances.
The third is a displacement reaction. One element reacts with one compound to form another element and another compound. Take the reaction of iron with copper sulfate solution as an example, $Fe + CuSO_ {4 }=\!=\!= FeSO_ {4} + Cu $, iron replaces the copper in copper sulfate. In such reactions, the valence of elements changes, reflecting the redox properties of the substance.
The fourth is the metathesis reaction. The two compounds exchange components with each other to form the other two compounds. Common reactions between acid and alkali salts, such as the reaction of sodium hydroxide with hydrochloric acid, $NaOH + HCl =\!=\!= NaCl + H_ {2} O $, the reaction is essentially a recombination between ions, and the reaction is more likely to occur when precipitation, gas or water are formed. The conditions under which the metathesis reaction occurs determine its application in the preparation and separation of substances.