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Mercury is a highly toxic substance, and it is used in many fields such as alchemy, medicine, metallurgy, printing and dyeing.
In the process of alchemy, the ancients believed that mercury had magical effects and could refine the so-called "elixir of immortality". The alchemists regarded mercury as the key raw material and went through a complicated refining process in the alchemy furnace, hoping to obtain this elixir. Although many emperors and generals believed in the ability to live forever, the facts proved that this was false, and many people who took the elixir lost their lives due to mercury poisoning.
In the field of medicine, mercury compounds used to be used in medicine in the past. Such as light powder, it has the effects of insecticide, attack poison, and astringent sores. It can be used externally to treat scabies, syphilis, and ulcer ulcers. Cinnabar can clear the heart, calm the mind, and detoxify. It is used for heart palpitations, insomnia, dreaminess, and mania. However, due to its strong toxicity, mercury is rarely used today to prevent mercury poisoning from harming health.
In the field of metallurgy, mercury can form amalgam with a variety of metals, which makes it important for metallurgy. For example, when refining precious metals such as gold and silver, mercury is used to form amalgam with gold and silver. After heating, the mercury evaporates, leaving high-purity gold and silver, providing an effective separation and purification method for metallurgical processes.
In the printing and dyeing industry, mercury compounds have been used as dyes or mordants to help dyes better adhere to fabrics, improve dyeing effect and color brightness and durability. However, in view of the toxicity of mercury, the modern printing and dyeing industry has abandoned such mercury-containing materials and opted for more environmentally friendly and safe alternatives.
In short, although mercury has been used in many fields in the past, its toxicity is extremely harmful to life, health and the environment. Today, its application has been strictly restricted. Humans are committed to exploring safer and environmentally friendly alternatives.

The synthesis of saltpeter is the key to the evolution of alchemy and pharmacy. There are many methods, and each has its own subtlety.
There is a method of mining and refining with natural saltpeter ore. Look for the ore veins in the mountains, their color is white or gray, and the texture is crystal clear, often containing saltpeter. After digging, first soak it in water, so that the saltpeter dissolves in water. This is the step of water dissolution. Then, take the solution and filter it with cloth or a fine sieve to remove its impurities and obtain a clear liquid. Then put the clear liquid in an open vessel and fry it slowly. When the water is gradually reduced, the saltpeter will be precipitated at the bottom of the vessel. This is the method of frying and crystallizing.
There are also those who combine various substances to obtain saltpeter. For example, simple nitrate is combined with other substances. Simple nitrate is slow, choose suitable excipients, or plant ash, or some ore powder, and mix it in a certain proportion. In a pill furnace, calcine at a specific heat. During this period, you need to pay close attention to the changes in the heat. If the fire is fierce, the medicine will be easy to burn, and if the fire is weak, the reaction will be insufficient. After this calcination, the chemical reaction will produce saltpeter.
There is also a method of refining with urine. Human urine contains many substances, including ingredients that can be used to make saltpeter. Collect the urine, place it in a large tank, and let it stand in the open air. Over time, precipitation will form. Take the supernatant, and then use the method of frying to remove the water, and you can get the crude saltpeter. After several times of purification, the water is repeatedly dissolved, filtered, and crystallized to obtain pure saltpeter.
In addition, according to ancient records, there are also those who use the soil of saline-alkali land as raw material. Take saline-alkali soil, add water and stir to dissolve the salt. Filter off the soil residue to obtain a saline solution. With a specific agent, the saltpeter component is precipitated and precipitated. Then, as the previous method of frying and purifying, saltpeter can also be obtained.
All these synthetic methods are the crystallization of the wisdom of the ancients and play an important role in many fields such as medicine and alchemy.

Mercury is very feminine in nature, and its quality is liquid. At room temperature, it is often in a fluid state, just like smart water, but its color is silver-white and its luster is dazzling, which is completely different from ordinary water.
Mercury has a high density, which is more than several times heavier than ordinary things. Its fluidity is excellent. If it is placed on a flat surface, it can be separated at a touch, and it flows in all directions, just like mercury cascading into the ground, all-pervasive. And mercury is volatile. Although it is slow, it persists in the open for a long time and gradually dissipates in the air. This property is also inconspicuous.
The melting point of mercury is very low, about minus 38 degrees and 87 degrees Celsius. When it is slightly warmer, it solidifies into a liquid state. Its boiling point is also not very high, about 357 degrees Celsius. When heated to this point, it turns into a curl of mercury vapor.
Although the chemical properties of mercury are relatively stable, it can also react with many substances. It can combine with sulfur powder to form mercury sulfide. This reaction is fast and easy, and is often a way to deal with mercury leakage. It can also form amalgam with metals such as gold and silver, just like water and milk. This amalgam state is also useful in metallurgy and other industries.
As for the toxicity of mercury, it is particularly fearful. If people take it by mistake or inhale its vapor, they can cause poisoning. Mercury poison enters the body, damaging the nervous, digestive, and urinary systems, causing dizziness, fatigue, and insomnia, which can endanger life. Therefore, when using mercury, be cautious to prevent unexpected disasters.

Mercury is a highly toxic substance, and its nature is cunning and changeable. The form of mercury, which is liquid at room temperature, rolls like silver beads, and is very agile, so it is also known as mercury.
Mercury has unique chemical properties. First, it has strong reducibility. When it encounters a strong oxidant, such as chlorine, the two react violently when they meet, and mercury is oxidized to mercury chloride. This reaction is rapid, showing the ease of mercury losing electrons, just like a warrior facing a strong enemy without flinching, showing its strong reducibility.
Second, mercury can form an alloy with a variety of metals, which is called amalgam. If it meets sodium, it instantly fuses to form sodium amalgam. This property was occasionally used in ancient metallurgy, as if mercury, with its unique charm, brought together different metals to form new substances.
Third, the properties of mercury compounds vary. Mercury oxide is easily decomposed when heated, releasing oxygen, just like a sleeping thing wakes up when heated and regains its life. Mercury sulfide, on the other hand, is relatively stable in nature and has a vermilion color. It was often used as a pigment in ancient times. Its stability made it fade over time, adding a bright color to many art treasures.
Fourth, although mercury is a metal, it has a low boiling point. When heated to 356.6 ° C, it turns into mercury vapor, which quietly fills the air. This property requires special attention, because its vapor is highly toxic, inhaling the human body, such as ghosts sneaking in, quietly damaging the nervous system, etc., which is extremely harmful.
Although the ancients did not have the precise understanding of today's people, they were well aware of the dangers and strangeness of mercury. In alchemy, mercury is sometimes the key thing, and sometimes it is awesome because of its toxicity. Its chemical properties are complex and changeable, just like an ancient mystery, attracting countless explorers to find out.

The price of a sea serpent varies from time to time, and varies from place to place.
In the past, in the land near the edge of the sea, people who were close to the sea often got a sea serpent. At that time, in the city, the price was not high. Because of the near sea, the output of sea serpents is quite abundant, and everyone can get them, so the stock in the city, the price is flat. The price per catty, or just a few dollars.
However, if it is inland, far from the sea, the sea serpent is rare. Because of its difficult transportation, it requires land and water, and consumes a lot of manpower and material resources, the price is high. In the city of Dayi, the capital, the price of a catty of sea serpent can be as high as tens of dollars, or even more than a hundred dollars.
And if there is a festive event, and everyone competes to buy a sea serpent to enjoy a good taste, or to use it for gifts, the demand will increase greatly. At this time, although the price is high, some people still go to great lengths to ask for it. Businesses often raise prices to seek big profits when they see the opportunity.
If the age is not good, the weather is bad, the sea is still frequent, or the climate is uncomfortable, the output of sea serpents will drop sharply, and there will be less goods in the city. Then its price will rise, far more than usual.
From this point of view, the price of sea serpents in the city, whether cheap or expensive, depends on the abundance of products, the difficulty of transportation, and the amount of demand. The market changes, and it is impermanent.