Butane-1-Sulfonyl Fluoride

Those who poison birds, their feathers are highly poisonous, and if they touch them, they will die. The sea serpent is also the water dyed by the poisonous feather. Its main use is quite dangerous.
Ancient walkers often used the sea serpent as a weapon for rebellion and life-threatening. When power and conspiracy are over, and rivers and lakes are in dispute, those with ulterior motives secretly put the sea serpent in their diet and wine. Once others drink it carelessly, the poison will die immediately, and the state of death is terrifying. Because of its rapid and abnormal poison, there is no medicine to solve it, and it often makes those who are recruited suffer unbearably, and lose their lives in an instant.
There are also those who use the sea serpent to quench on the blade of a weapon. When killing on the battlefield or assassinating in secret, where the blade of the weapon is wounded, the poison enters the body with blood, and even if the injured person is not dead for a while, he will gradually die out of breath due to the poison. In this way, the power of the weapon is greatly increased, and the murder is invisible.
However, the poison of the sea serpent Lushui is harmful to the living beings and goes against human relations. It is used for evil, adding more grievances to the world and disturbing the peace. Although in troubled times, it is regarded as a sharp weapon by those with bad intentions, but the way of heaven is clear. Such poisons hurt people and kill people, and are ultimately despised by the gentleman, and it is also not tolerated by the justice of the world. Its existence is just an evil trick in a dark corner, adding a lot of horror and misery to the world, and it is not used by the right way.

It is good to have what you want, but you should do it wholeheartedly. The scene of a mirage is fantastic and strange, and it is amazing to the world. Its physical properties are briefly described as follows:
The formation of a mirage is related to the principle of folding and reflection. When light travels in different media, its speed varies and its direction also changes, which is refraction. When light enters the light-dense medium from the light-sparse medium, the refracted rays approach the normal; otherwise, they are far away. Reflectors, on the other hand, encounter the image of turning back at the interface.
In the land by the sea or in the desert, it is easy to appear mirages. On the sea, the lower air is dense due to the temperature of the water, and it is a light-dense medium; the upper air is hot and thin, which is a light- The light of the distant scenery, from dense to sparse, the refraction angle gradually increases, and when it reaches the critical angle, total reflection occurs. This light turns back into the human eye, and then you see a mirage, like a castle in the air, ethereal and illusory.
In the desert, the situation is the opposite. The sand surface is heated, the air near the sand is hot and thin, and the upper layer is cold and dense. After the light is dense and sparse, refracted and fully reflected, the image of the scenery on the ground appears in the air, like the scenery of a lake, attracting people to it, but there is no existence when it is close, adding to the sense of illusion.
There is another difference between the mirage scene above and the mirage scene below. The upper mirage is more common in the cold sea, and the image of the scenery appears in the sky; the lower mirage is often found in the desert, and the scenery seems to be below the ground. Its shape and state are influenced by many factors of climate and geography, and it changes rapidly and is elusive.
When people look at mirages, they are often fascinated by their fantasies. Although it is physical, it is caused by changes in the behavior of light. Although the scenery is as beautiful as a dream, it is not real in the end. It also makes our generation know the wonders of nature and the mystery of physics, which is endless. We should use scientific thinking to explore it, so that we will not be confused by appearances.

The discussion of the nature of lead and mercury in "Tiangong Kaiwu" is related to the mystery of creation in the world, and it is particularly delicate. Lead and mercury, the genus of hardware, are changeable, and are of extraordinary use in alchemy and all kinds of processes.
Lead, gray and heavy in quality, heavy and soft in nature, can be extended like paper. In fire, it initially melts into fluids, and its color turns bright yellow, like a flame. After a long time, it melts in contact with oxygen, and the surface gradually becomes frost. This is also the oxide of lead. Lead can be combined with various metals to form alloys to increase its firmness, and has a wide range of uses. In the art of alchemy, lead is often used as a medicine to help the sublimation of mercury and turn decay into magic.
Mercury, commonly known as mercury, is liquid and silver-white at room temperature, agile as beads, and rolling indeterminately. Its nature is yin and cold, and it is easy to evaporate when heated. It rises into gas and is invisible. The strangeness of mercury lies in its ability to dissolve gold, such as gold, silver, copper, etc., and combine it into amalgam. During alchemy, mercury is the key thing. After being refined by water and fire, it can be turned into alchemy sand, which is red and bright in color. The ancients believed that it can prolong life. Although there is no scientific evidence, it can be seen that it is heavy in alchemy.
Lead and mercury, although different in nature, are sympathetic to each other and change endlessly. In nature, lead and mercury often coexist in symbiotic veins and depend on each other. In the artificial method, alchemists use lead to make mercury, and mercury to combine lead to explore the secrets of creation. The thickness of lead can suppress the agility of mercury; the cold of mercury can make the dryness of lead. The two complement each other. Between the creation of heaven and earth, they deduce endless changes. They are really treasures of nature. They are the key of ancient craftsmanship and alchemy, and lead countless wise men to explore their mysteries and glimpse the mysteries of creation in heaven and earth.

"Tiangong Kaiwu" is a collection of ancient technology, which is related to the application of arsenic in synthesis, and there are indeed many things worth detailing.
Arsenic, chemical name arsenic trioxide, is highly toxic. In ancient times, its application in the field of metallurgy was quite unique. For example, in some metal smelting processes, appropriate amounts of arsenic can be used as an additive. Because arsenic can react with some impurities in ores, changing the physical and chemical properties of impurities, thereby helping to separate and improve metal purity.
Furthermore, when alchemy was popular, arsenic was often included. Alchemists believe that arsenic may interact with other gold and stone medicines through specific refining procedures, in the hope of refining medicinal pills with magical effects. Although there is no scientific basis for this idea, it also reflects the application of arsenic in the process of "synthesizing" medicinal pills at that time.
However, it needs to be understood that arsenic is extremely toxic, whether in metallurgy or so-called alchemy applications, a little carelessness can cause poisoning. In ancient times, poisoning due to exposure to arsenic was not uncommon. Although the ancients knew the role of arsenic in some "synthesis" processes, their understanding of its toxicity was also deepening. When using it, they would also take many protective measures, such as wearing special clothes and operating in well-ventilated places, to minimize the harm of arsenic to the human body.

"Tiangong Kaiwu" is a comprehensive work on agricultural and handicraft production in ancient times in our country. If refined salt was made in ancient times, the method is roughly as follows:
The first brine containing salt is derived from salt lakes, salt wells, etc. Such as in Sichuan, the brine of salt wells is rich, and its quality contains many impurities. First introduce the brine into a large pot, use firewood as fuel, and cook it hot. During the decoction, the water gradually evaporates, and the concentration of salt rises gradually.
When the brine is concentrated to a certain extent, fine salt grains precipitate. At this time, it is necessary to use tools such as a long-handled wooden spoon to stir slowly to make the salt particles crystallize evenly and not stick into lumps.
However, the newly obtained salt still contains impurities such as sediment, magnesium sulfate, calcium chloride, etc., which need to be further purified. Take a container and spread it with a fine bamboo mat or gauze as a filter medium. Dissolve the primary salt in an appropriate amount of hot water to form a salt solution, and slowly pour it into the container where the medium is laid. Large particles of impurities such as sediment remain on the medium, while the salt solution flows down through.
Next, add an appropriate amount of lime water and soda ash to the resulting cleaner salt solution. Due to the reaction of calcium hydroxide and magnesium sulfate, a magnesium hydroxide precipitate is formed; sodium carbonate reacts with calcium chloride to form a calcium carbonate precipitate. Let stand for a while to allow the precipitate to completely settle at the bottom of the container. After
, filter the salt solution again with a fine substance to remove precipitated impurities. Finally, pour the pure salt solution back into the pot, fry it slowly over low heat, evaporate the water, and recrystallize the salt grains. At this time, the salt obtained is much more pure than the original salt, white as snow, and can be used for food or other purposes. In this way, after multiple processes, the final refined salt is obtained.