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Mercury, also known as mercury, had an important use in ancient alchemy. Although mercury is not too much in the field of alchemy in "Tiangong Kaiwu", its main use can be seen in combination with the relevant knowledge of ancient alchemy.
First, mercury is often used to refine pills in pursuit of immortality. Ancient alchemists believed that mercury has magical properties and can be transformed into "divine pills" through complex alchemy procedures. For example, Ge Hong's "Baopuzi Jindan" records that many alchemy formulas involve mercury. Due to the special shape of mercury, liquid at room temperature and metallic luster, the ancients regarded it as having extraordinary characteristics and expected it to be absorbed by the human body and achieve longevity.
Second, mercury is used to refine medicinal pills that can cure diseases. Ancient medical knowledge is limited, and some doctors believe that mercury can treat diseases. " The Book of Shennong Materia Medica lists mercury as the middle grade, saying that it is "the main scabies and scabs that choose white baldness, kill lice in the skin, abortion, remove heat, and kill gold, silver, copper, and tin poison". Although some claims are known to have no scientific basis, mercury played an important role in the refining of medicinal medicinal pills at that time.
Third, mercury participated in metal transformation experiments in alchemy. The ancients fantasized about turning ordinary metals into precious metals, and mercury was often selected as a reactant due to its active chemical properties. If it reacts with metals such as lead and tin, it is expected to achieve "turning a stone into gold". Although it was unsuccessful, it promoted the accumulation of ancient chemical knowledge.

Mercury is a highly toxic substance, commonly known as mercury. It is a liquid at room temperature and is a shiny silver-white metal. Its physical properties are unique, with the following endpoints:
First, the melting point is very low, only -38.87 ° C. This characteristic makes it easy to maintain a liquid state in a normal temperature environment without severe low temperature conditions. For example, at ordinary indoor temperatures, mercury is always a flowing liquid.
Second, the boiling point is quite high, reaching 356.6 ° C. This property means that extremely high temperatures are required to boil mercury into a gaseous state. In general heating scenarios, mercury is not easy to rapidly gasify.
Third, the density is extremely high, at 13.59 grams per cubic centimeter. Compared with common metals such as water (density about 1 gram/cubic centimeter), the density of mercury far exceeds that. If mercury is placed in water, mercury will sink rapidly.
Fourth, mercury has excellent fluidity. Due to its liquid properties and low surface tension, mercury droplets are easily rolled on a flat surface, and its shape is easy to change, allowing it to spread rapidly.
Fifth, mercury has good electrical conductivity. Although it is slightly inferior to metals such as silver and copper, it can still conduct current effectively and is occasionally used in some electrical components.
Sixth, mercury has a metallic luster, showing a bright silver-white color, shining brightly under the light, making it very recognizable.
However, mercury is highly volatile and will slowly evaporate to form mercury vapor even at room temperature. Mercury vapor and its compounds are highly toxic. Once inhaled or exposed to the human body, it will cause serious damage to the nervous system, kidneys and many other organs. Therefore, when using and handling mercury, it is necessary to be extremely cautious and follow strict safety procedures.

Mercury is a highly toxic substance with unique chemical properties. Mercury, liquid at room temperature, is a metal element, symbol Hg, commonly known as mercury.
Mercury has good electrical conductivity and is used in many electrical instruments. Its chemical activity is moderate. Although it does not react easily with other substances like some metals, it can interact with many substances.
Mercury can react with oxygen under heating conditions to form mercury oxide. This reaction is quite wonderful. When heated, red mercury oxide is gradually formed on the surface of mercury. Mercury can also react quickly with sulfur powder to form mercury sulfide. This property is crucial in dealing with mercury spillage accidents. Sprinkling with sulfur powder can convert highly toxic mercury into relatively stable and less toxic mercury sulfide.
There are many kinds of mercury compounds with different properties. Some mercury salts are oxidizing and can be used as oxidants in chemical reactions. Mercury ions can also form precipitates with many anions, which can be used to detect and separate mercury ions.
However, mercury and its compounds are toxic and can cause serious damage to the nervous system, kidneys, etc. after entering the human body. Although the ancient people did not fully understand the principle of its toxicity, they also knew the danger of mercury in long-term practice. When using mercury and related treatments, extreme caution is required to avoid irreparable harm to the human body and the environment.

The combination of mercury and arsenic, the ancient recipe has a method, the following is the way to combine it:
First, "Baopuzi Jindan", To combine mercury and arsenic, it is necessary to use red sand, male, female, etc. Take the red sand first, and remove it by the method of water, so that it is like powder. Then put the male and female in the crucible, roast it with charcoal fire, melt the liquid, put it into the red sand powder, and mix it evenly. It is placed in a dense cauldron, with a civil and military fire. At the beginning of the slow roasting with a gentle fire, so that the properties are integrated; with a fierce fire, make it coagulate. After this, you can get the combination of mercury and arsenic.
Second, according to the "Taozang · Law", use a porcelain bottle for one, first put one inch thick white powder on the bottom of the bottle. Take the amount of mercury, put it in the bottle, and cover it with arsenic powder, which is half an inch thick. Then put one inch of soil on the arsenic, which is one inch thick. Seal the mouth of the bottle and reinforce it with water. Dig the ground, fill it with charcoal, and place it in the porcelain bottle. First, use a low fire for three days, so that the mixture can be slowly reversed; then increase the heat, 5 days. During the period, pay attention to the heat, do not make it fierce or weak. For five days, remove the fire and cool the bottle, and the bottle can be combined.
Third, "Materia Medica" also has a similar effect. Take one catty of mercury, half a catty of arsenic, and one catty of soap. First, grind the soap, stir-fry it until it is colored, and then produce the compost. Then put the mercury and arsenic into the compost, and mix well. Seal the compost with the compost, seal it with mud, and do not let it leak. Put a charcoal fire on the stove, and first reduce the fire for half an hour, so that the compost is initially mixed; if the fire is high, it will be one hour. Turn off the fire and let it cool, and take the compost. This is the combination of mercury and arsenic.
However, it needs to be made clear that mercury and arsenic are all poisonous things, and the combination of operations makes it dangerous, and this combination is mostly used by ancient alchemists to pursue health or medicine. The effect of science and technology should not be easily used, so as not to endanger life and safety.

Mercury is also a highly toxic thing. When storing and transporting mercury, many matters should not be careless.
Those who store mercury should first choose a sealed container. Mercury is volatile. If the container is not tight, the mercury gas will escape from the outside, causing great harm. Therefore, it must be stored in a thick glass or metal dish, and tightly sealed to prevent mercury gas leakage.
As for the storage place, it should be a cool, dry and well-ventilated place. Mercury is easily vaporized when heated, and if it is in a high temperature place, the volatilization will accelerate. And humid places, or the corrosion of the mercury device, will also cause leakage. If the ventilation is good, the mercury gas that is occasionally discharged can be dissipated in time to prevent its accumulation.
Furthermore, mercury should be kept away from sources of fire and strong oxidizing agents. Although mercury is difficult to burn, it is also dangerous when it encounters hot topics or strong oxidizing agents. And mercury and some oxidizing agents can react chemically or cause accidents.
When transporting mercury, the packaging must be stable. First contain mercury in a sealed container, and then put it in a strong outer box. Fill the box with buffers, such as foam, cotton, etc., to prevent the container from being damaged due to transportation bumps.
The transporter should be professionally trained and familiar with the characteristics and hazards of mercury. When handling, handle it with care and do not drop it. If there is a mercury leak on the way, dispose of it as soon as possible according to emergency measures.
Also, whether it is stored or transported, it must be clearly marked. Express words such as "highly toxic" and "careful mercury leakage" make everyone aware of the risk and treat it with caution.
In short, the storage and transportation of mercury is related to everyone's safety and environmental safety. Every step and every attention should not be ignored, and must be treated with rigor.