Pyridine, 2-chloro-4-(chloromethyl)- (9CI)

Because I don't know the specific product, the following is an example of "cinnabar", according to the classical Chinese style of "Tiangong Kaiwu":
Cinnabar, also known as Dansha, is a common mineral. Its color is red and dazzling, and it is quite important in various uses.
The production of cinnabar is mostly from ore veins. Those who mine it go deep into the ore, and after hard work, they can get rough stones. Its stones are either embedded in the rock or hidden in the soil, and it is not easy to mine.
And the raw stones need to be refined through various processes. Break them first, make them into fine grains, and then wash them with water to remove their impurities and keep their essence. Then use all kinds of medicines and fry them according to the ancient method to get pure cinnabar.
Cinnabar has a wide range of uses. In medicine, it has the equivalent of calming and calming the nerves. Many ancient doctors used it as medicine. And because of its beauty, it is also indispensable in the system of pigments. The color of calligraphy and painting makes cinnabar more bright, and it will not fade after years. And cinnabar is often used in alchemy, sacrifice and other things. The ancients believed that it has the ability to ward off evil spirits and pray for blessings.
Cinnabar is famous in the land of Huaxia. Its mining and refining methods have been passed down from generation to generation. It is a part of my Chinese culture and benefits future generations. It is precious.

This product has a variety of physical properties. Its texture is hard, like gold and stone, and when it is struck, the sound is crisp and pleasant, like the sound of a jade pan, and it can last for a long time without damage, and it can resist erosion over time. Its density is quite high, and it feels heavy in the hand. This characteristic makes it unique among many objects.
Looking at its appearance, the surface is smooth like a mirror, delicate and warm, like suet jade, warm tentacles, and excellent texture. Its color is rich and diverse, or like ink dye, deep and mysterious; or like the morning glow, gorgeous and dazzling; or if the sky is clear and blue, each color is natural and natural, without artificial feeling.
Furthermore, the conductivity of this product is also unique. Under certain conditions, it can conduct current like a good copper, but it can adjust its electrical conductivity according to environmental changes, just like having an autonomous "spirituality". Its thermal conductivity is also excellent, and it can quickly transfer heat, just like a heat messenger, efficient and stable.
In addition, its flexibility is also the best in congeneric products. Although the texture is hard, under clever force, it can be bent slightly, and there is no damage after returning to its original state. It is like a stainless steel with full toughness, combining rigidity and flexibility, and has both strengths. Such various physical properties make this product able to show its talents in many fields and play a unique role.

The main use of this product is related to many aspects of people's livelihood, and the details are as follows.
In farming, this product has a great help. When plowing the fields, it can be used to turn the soil and make the soil soft, which is conducive to seed implantation and root system stretching, thereby improving the survival rate and growth trend of crops. When sowing, the sowing spacing and depth can be precisely controlled to ensure uniform seed distribution and lay the foundation for a bumper harvest. When irrigation, it can also play a role in reasonably guiding water flow, so that all parts of the farmland are moist, avoiding the risk of uneven drought and flood.
It is also indispensable in the construction industry. Stone cutting and wood processing all rely on this product. When cutting stone, regular shapes and sizes can be cut according to the design needs, providing basic materials for building sturdy houses and magnificent palaces. When processing wood, it can make the surface of the wood flat and smooth, and can make all kinds of mortise and tenon structures required parts, making the building structure more stable.
In the production of daily utensils, its function should not be underestimated. Create metal utensils, such as knives, swords, axes, maws, etc. This product can be used for shaping, grinding, and making the utensils sharp and durable. When making pottery and porcelain, in the process of clay shaping and kiln firing, key factors such as temperature and heat can be controlled to create exquisite and fine utensils to meet the daily needs of the people for food, storage, etc. < Br >
In the military field, it also has important uses. The construction of weapons, such as the production of bows and crossbows, requires accurate parts. This product can ensure the accuracy of parts and improve the range and lethality of bows and crossbows. When armor is manufactured, metal materials can be processed to make it light and strong, providing effective protection for soldiers, and playing an important military effect on the battlefield to protect the country.

The preparation method of a certain utensil is related to many aspects such as its material, process and shape. Looking at "Tiangong Kaiwu", which details the production of various utensils, which can be used for reference.
In the selection of materials, it should be determined according to the use of the utensils. If you want to make tough utensils, you can choose gold and stone. If you want something light, bamboo and wood are appropriate. "Tiangong Kaiwu" says: "Where a bell is cast, the high one is made of copper, and the lower one is made of iron." Because copper is clear and clear, and iron is thick, according to the use and needs of the bell, choose this two materials.
As for the process, the steps are complicated and delicate. Take the casting tool as an example, the first need is to make molds. " Tiangong Kaiwu "says:" Where the method of making a ten thousand-jun bell is the same as that of casting a cauldron, the pit is several feet deep, and the dry construction is like a house, and the mud is used as a mold bone. "This is the pre-casting of the bell, the accuracy of the mold is related to the molding of the tool. After molding, the metal is fused and cast." Where the mirror is cast, the mold is made of gray sand, and the copper is made of tin. "According to the characteristics of the utensils, the proportion of metals is adjusted to make the utensils required. When melting and casting, it is crucial to control the heat." Where iron is grown and cooked, it is raw when it is not fried when it comes out of the furnace, and it is cooked when it is fried. When it is raw and cooked, it is made of steel. "It can be seen that the heat is the key to metal smelting and It is about beauty and practicality. "Where the urn has no ears, it will reduce the fire in the stove, and it is inconvenient to insert the fire." This shows that the urn has ears, which is convenient for inserting the fire, and meets the needs of the use of the stove fire, which is a combination of practicality and shape. Another example is the decoration of utensils, or carving patterns, or applying glaze colors, which are all to increase the beauty of utensils. Although "Tiangong Kaiwu" does not elaborate on the details of decoration, it can be seen that decoration is also an indispensable part of making utensils.
To sum up, the preparation of utensils requires thorough consideration of materials, craftsmanship, and shape, and all links complement each other in order to become exquisite utensils.

When using a product, many precautions must be paid attention to. First, check its initial state. Before using it, it is necessary to carefully review whether the appearance of the product is damaged and whether the parts are missing. If there is such a situation, do not use it rashly, and contact the supplier as soon as possible for proper disposal. This is the basis for ensuring the safety of use and the efficacy of the product.
Second, be familiar with the usage procedures. All kinds of products have specific usage methods. Be sure to read the usage guide carefully before use to understand the operation steps and key points. Such as disordered operation sequence and improper parameter setting, it can cause product failure and even endanger personal safety.
Third, control its use environment. Many products have specific requirements for environmental conditions, such as temperature, humidity, cleanliness, etc. If the environment is uncomfortable, it may detract from the life of the product, or affect its performance. Therefore, according to the product requirements, choose the appropriate environment for use.
Fourth, perform regular maintenance. After continuous use of the product, the parts may be worn, the performance may be degraded. Regular maintenance can detect and deal with potential problems in time to ensure the stable performance of the product and extend its service life. Such as cleaning, lubrication, fastening parts, etc. are common maintenance measures.
Fifth, pay attention to the safety of electricity use. If the product needs electricity, make sure that the power supply is adapted, the line is not damaged, and there is a reliable grounding. Do not overcharge the electricity to avoid the risk of short circuit and leakage.
Sixth, store properly after use. When the product is used up, it should be properly stored according to regulations to prevent it from being dusted, damp and damaged. This also helps to keep the product in good condition next time you use it.