5-Bromopyridine-2-carbaldehyde

"Tiangong Kaiwu" has a saying: "Jujube, chestnut, hazel, pine, tallow, tung and the like, if they are not grain but also planting art, they will substitute vegetables for salary, and tallow is prosperous." The use of tallow is quite extensive.
The seed of tallow can extract oil. Its seed oil has many uses, one of which can be used for lighting. In ancient times, lighting relied on oil all the time. When tallow oil burned, the flame was bright, which could solve the problem of no light at night. In ordinary people's homes and various places, it was a commonly used lighting oil to drive away darkness and illuminate the places where they worked and rested at night. Second, tallow oil can be used to make wax. Wax is indispensable in many aspects, such as sealing objects, making candles, etc. The wax made of tallow oil is of good quality and can meet different needs.
The wood of tallow has a solid texture. It can be used to add materials to the building. When building a house, the wood can be used as beams and columns to support the structure of the house and bear the heavy responsibility of shielding from wind and rain. It can also be used to make furniture, tables, chairs, beds, etc., which are sturdy and durable, both practical and beautiful, adding convenience and elegance to home life.
The leaves of tallow also have wonderful uses. In autumn, the color of the leaves turns red and is as bright as Danxia, which is very ornamental. In the creation of garden scenery, it can add a touch of gorgeous color and attract people to stop and watch. And after the leaves are treated, they may be used as medicine, which may have an auxiliary healing effect on some diseases and add a boost to traditional medicine.
Sapium has important uses in many fields, whether it is lighting, wax making, construction, viewing, medicine, etc., it plays a role that cannot be ignored. It is really a precious product bestowed by nature on human beings.

Mercury is a highly toxic thing, but it is occasionally involved in the art of alchemy and the ancient medical way. However, in today's world, health and safety are important, so it is rarely used. As for the method of making aluminum amalgam, although the ancient books have not detailed it as accurately as the science of later generations, but with the ancient thinking, one can deduce one or two.
If you want to make aluminum amalgam, you first need to obtain mercury. In ancient times, mercury was mostly extracted from Dan Sha. "Baopuzi Inner Chapter" says: "Dan Sha burns into mercury." That is, Dan Sha (mercury sulfide) is calcined to precipitate mercury. After obtaining mercury, if you want to make aluminum amalgam, you need to take aluminum. The ancient method of smelting aluminum is far less convenient than it is today. The method of smelting aluminum from bauxite ore was not available in ancient times. However, occasionally, aluminum may be obtained. As described in "Tiangong Kaiwu", metallurgical things, or methods similar to metal smelting, can be considered for flexibility.
If aluminum and mercury are obtained, when making aluminum amalgams, use clean utensils to contain mercury, and slowly add clean aluminum. Ancient utensils, or pottery, porcelain, copper, etc. It should be noted that mercury is volatile and highly toxic. When operating, use a small fire to slowly heat, so that aluminum and mercury are fused. When heating, you need to carefully control the temperature. If the fire is large, the mercury will easily escape, and if the fire is small, it will be difficult to fuse. In ancient times, there was no accurate temperature measurement, but only the perception of experience and heat. When the two are fused, aluminum amalgam is formed.
However, it should be noted that the system of amalgam was mostly obtained by alchemists or by chance in ancient times, and it is not a common technique. And the harm of mercury poisoning is now clear. Although the ancient method is used to describe its system, it should not be tried easily, so as not to hurt the body.

Lead and mercury are the second of the hardware. Lead, blue in color, heavy in nature, like tin in shape, soft and malleable. Often hidden between mountains and rivers and stone veins, it melts in case of fire and turns into a liquid, agile and unstable.
The nature of lead is calm and introverted, feminine and dominant. In the way of alchemy, it is often used as a foundation. The ancients said: "Lead is the ancestor of medicine, the master of hardware." Gai because of its condensing power, can make all medicines harmonize, keep in the middle and not disperse. And lead can contain mercury, and the two can form a wonderful change.
Mercury, white as silver, at room temperature, is a flowing liquid, lively, volatile, and easily sublimated. It is light in weight and has the nature of spiritual transformation, just like silver in water, and its agility is elusive.
Mercury belongs to water in the five elements, while its nature is more yang, and it is a thing of the highest yang. In alchemy, mercury symbolizes the essence of yang, which is agile and flying, and changes without reason. However, its nature is too lively and difficult to restrain. It has to be quiet and heavy of lead, and it cannot be used together.
The two lead and mercury, one yin and one yang, one static and one moving, cooperate with each other. Lead, with its thick nature, makes mercury fly; mercury, with its agility, has the potential to produce lead. The combination of the two, like a couple, has the symmetry of yin and yang. In the process of alchemy, various wonderful chemical changes can occur, achieving golden elixir. The physical properties of these two are the key elements for ancient alchemists to open up the mysterious world of medicinal pills, and also an important means for exploring material changes and pursuing long-term vision.

Aluminum amalgam is a mixture of aluminum and mercury. Its chemical properties are unique and worthy of investigation.
Aluminum is active and easily oxidized in the air, forming a dense aluminum oxide film, which can prevent further oxidation of aluminum. However, when aluminum forms an amalgam, the situation is different.
Aluminum in amalgam, due to the presence of mercury, the aluminum oxide film on its surface is difficult to form or maintain stability as usual. The aluminum atom interacts with the mercury atom, and the activity of aluminum is revealed to a certain extent.
First, aluminum amalgam can react with water. Water is a compound of hydrogen and oxygen. When aluminum amalgam encounters water, aluminum can be replaced with water, and aluminum replaces the hydrogen in the water to form hydrogen. The degree of reaction is more severe than that of pure aluminum and water. This is because the presence of mercury weakens the protection of aluminum oxide film on aluminum, making aluminum more susceptible to contact and react with water.
Second, in air, aluminum amalgam will still react with oxygen, but the reaction mode is different from that of pure aluminum. Due to the influence of mercury, the process of aluminum reacting with oxygen to form aluminum oxide, and the shape or distribution of the product is different. The formation of aluminum oxide on the surface of aluminum amalgam is not uniform and dense, so that the aluminum inside the aluminum amalgam continues to contact oxygen, and the reaction can be further carried out.
Third, the reaction of aluminum amalgam with acid is also quite characteristic. Common acids, such as hydrochloric acid, sulfuric acid, etc., aluminum amalgam reacts with it at a faster rate. Aluminum can replace hydrogen ions in the acid to form aluminum salts and hydrogen gas. This reaction is faster than pure aluminum reacting with acid, because the amalgam destroys the oxide film on the surface of aluminum, so that aluminum can be more fully contacted with acid.
From the above, it can be seen that aluminum amalgam changes the original chemical properties of aluminum due to the intervention of mercury, making it react with water, oxygen, acid and other substances, showing different characteristics from pure aluminum.

Looking at your questions today, I am inquiring about the city of hardware, especially the price of silver in hardware. Hardware is the essence of heaven and earth, and the necessity of people's livelihood. In the market, its price changes constantly. It is valued by merchants and observed by the people.
Silver is ancient and expensive, with the ability of coins, and also uses various ornaments and medical methods. The change of the city is influenced by various reasons. The first is the balance between supply and demand. If there are many people who seek silver in the world, such as the decoration industry is prosperous, and the industry is multi-purpose, and the output of silver has not increased, its price will rise; on the contrary, if there are few people seeking but more production, the price will decline.
The second is the shadow of current politics. The government decrees of the country, the adjustment of taxes, and the regulations of coinage are all related to the price of silver. If the country is prosperous in minting silver as a coin, the demand for silver will increase greatly, and the price will also rise; if the tax changes and silver is involved, it can also move the city.
Furthermore, the stability of the world situation also has an impact. If the world is safe, business travel is common, the transaction of silver is orderly, and the price is usually stable; in the event of war, famine, and the world situation is turbulent, silver is the choice to preserve value, and everyone strives to buy it, and the price will leap.
There is also the art of colonization, and the conspiracy of merchants. Those who are good at seeing the times change, and hoarding is strange. If the silver price will rise, when they are waiting to be hoarded, there will be less silver in the market, and the price will rise; and when the price is high, they will sell, and the price will fall.
As for the current market price of silver, it is difficult to determine, considering its rapid changes, it changes according to the city's supply and demand, the change of current affairs, and the state of the world. To know the real-time price, you can only know the general idea when you ask the people of the cities, the money shops, or look at the reports of various business conditions.