5-bromo-3-iodopyridin-2-amine

Among the many things involved in "Tiangong Kaiwu", the use of alum is quite extensive and critical. The main uses of alum are slightly as follows.
First, it is used in the dyeing process. In the textile dyeing industry, alum is an important mordant. After the fabric is treated with alum, the dye is more firmly combined with it, and the dyed color is not only brighter, but also can be maintained for a long time, not easy to fade. This effect greatly improves the quality and stability of dyeing, so that the color of textiles remains as beautiful as ever in the passage of time, and has a profound impact on the development of the textile industry.
Second, it is used in papermaking processes. In the paper manufacturing process, alum can be applied to the surface of the paper to form a protective film to reduce the water absorption of the paper and make the paper have better anti-penetration properties. In this way, the pen and ink written on the paper are not easy to smudge, ensuring clear handwriting, which is of great significance to the improvement of the quality of writing and printing, and promotes the progress and cultural inheritance of the paper industry.
Third, it also has its own impact in the field of food processing. Take the production of fritters as an example. Alum and baking soda and other substances work together to produce carbon dioxide gas, which makes the fritters expand rapidly during the frying process, forming a loose and porous structure, making it crispy. Although the use of alum in food is strictly restricted due to health concerns today, its role was once indispensable in traditional food processing techniques.
Fourth, alum also has certain medicinal value in medicine. Some alum can be used as medicine, with the effects of astringency, dryness, detoxification, etc. It can be used to treat some skin diseases, such as eczema, to relieve skin itching, exudation and other symptoms; it can also be used to treat oral ulcers and other diseases, to play a role in converging sores and promoting healing.
In short, alum plays an important role in dyeing, papermaking, food processing, medicine and other fields, and has made significant contributions to the development of ancient production and life and related skills.

If you want to make a combination of five nitrates, three and two alum, there are various methods, and it is also described in "Tiangong Kaiwu".
One is the method of purifying saltpeter. Take saltpeter and put it in a kettle, soak it in water, cook it slowly, wait for it to dissolve, and remove its filth. Fry it again over warm heat, so that the water is gradually less, until crystals precipitate, and then drain the remaining water with a cloth and put it in a ventilated place to dry, to obtain pure saltpeter.
Second, the method of processing saltpeter. When the sand is dry, it needs to be made of vinegar. Take an appropriate amount of saltpeter and add it to the vinegar. When soaking, add stirring when necessary, so that the saltpeter and the vinegar are fully blended. After some time, pour the supernatant, leave it to precipitate, rinse it with water several times to remove the vinegar taste and impurities, then dry it, and process it.
Third, the method of refining alum stone. Choose a good alum stone, smash it into small pieces, place it in a crucible, and calcine it with fierce heat. When the alum stone is heated, the water evaporates and the color gradually changes. When it is completely discolored and the texture is crisp, take it out and cool it. Then use the stone mortar to form a powder, which is the required alum powder.
Fourth, the method of combining medicine. Put the purified saltpeter, the processed sand, and the refined alum stone in a mortar in a certain proportion. Grind slowly to ensure that the three are evenly mixed. When grinding, do not use too much force to avoid the powder flying away. When it is fully mixed, this five-nitrate-three-dialum compound prescription has to be completed. The whole process requires attention to the size of the heat, the length of time, and the accuracy of the ratio in order to make a good medicine.

5-Phlegm is transformed by the body fluid, and its sex is viscous. 3-Phlegm is a disease, which is everywhere and variable. 2-The physical properties of phlegm have the following ends:
Phlegm is shaped when it is gathered, and qi when it is scattered. Its quality is either clear or thin, or thick. Those who are thin are in the shape of water, with good fluidity, and are easy to cough out; those who are thick are in a colloidal state, which is quite sticky, but difficult.
When looking at its color, it is also different. Ordinary people's phlegm is mostly colorless and transparent, or white, which is the appearance of calm in the body fluid. If you feel external evil, the color of phlegm changes. The wind and cold are on the surface, the lungs are lost and descend, and the phlegm is white and thin, like frost and snow, which is caused by the cold evil stagnating the body fluid; the wind and heat invade the lungs, the lungs are heated and scorched, and the phlegm is yellow and thick, just like the intensity of the scorching sun, all caused by the heat evil tormenting the body fluid. If there is blood in the phlegm, red and bright, or the lung collaterals are damaged, or due to yin deficiency and fire, it burns the lung yin and forces the blood to act recklessly; if the blood is dark purple, or there are blood clots, it is mostly blood stasis and internal resistance, and the blood is not smooth.
The smell of phlegm can also distinguish its pathogenicity. Normal phlegm, slight smell. If the phlegm has a fishy smell, it is mostly a sign of lung carbuncle, which is caused by heat and toxicity in the lungs, and the meat rotts into pus, so the smell is foul; if the phlegm smell is sour, it is often stopped in the food, the stomach qi is reversed, and the phlegm comes out with the stomach qi, so there is a sour smell.
Furthermore, the amount of phlegm is also related to the condition. If the amount is small, it may be caused by dryness and damage to the lungs, loss of body fluid, and nothing can be dissolved; if the amount is large, it may be due to the loss of good luck of the spleen, the internal stop of water and dampness, and the accumulation of phlegm, or the deficiency of the kidney yang, the loss of gasification and loss of faculties,
From this perspective, the physical properties of phlegm, including color, texture, odor, and amount, are all related to the function of human viscera and the rise and fall of evil energy. Observing the characteristics of phlegm can provide an important basis for identifying diseases and treating drugs.

Mercury is a special chemical substance with unique chemical properties and many characteristics.
Mercury is liquid at room temperature and pressure, and it is the only metal element that is liquid at room temperature. Its fluidity is very good, like a silver bead rolling. And the melting point of mercury is extremely low, only -38.87 ° C, and the boiling point is 356.6 ° C.
Mercury has moderate chemical activity. In air, it is basically stable at room temperature, but when heated to a specific temperature, it will react with oxygen to form mercury oxide. This reaction is as follows: 2Hg + O ² $\ stackrel {\ Delta }{=\!=\!=}$ 2Hg O.
Mercury can form alloys with many metals, and these alloys are called amalgams. For example, sodium amalgam can be formed with sodium, and silver amalgam can be formed with silver. This property has many applications in the fields of metallurgy and dentistry in the past.
Mercury compounds are also diverse. Such as mercury chloride, which is highly toxic, was used in some disinfectants in the past; mercury sulfide is red, commonly known as cinnabar, and is one of the traditional pigments.
In addition, mercury is volatile, and its vapor is also toxic. Even at room temperature, mercury will slowly evaporate into the air. If it is exposed to mercury vapor for a long time, it will seriously damage human health and cause diseases of the nervous system, kidneys and many other organs. Therefore, when using and handling mercury, it is necessary to exercise extreme caution and follow strict operating procedures to prevent the leakage and volatilization of mercury and ensure environmental and personal safety.

If you want to hide and transport mercury and lead, you need to pay attention to many matters. Mercury is good in nature and flows, its quality is agile, and it is easy to evaporate into the invisible. When hiding, you must hold it in a secret vessel, and do not let it deflate. The vessel should be thick-walled to prevent damage and leakage. And hide it in a cool and dark place, avoiding the sun and heat. If it is hot, the mercury gas will dissipate.
When shipping, protective gear is indispensable. Wrap your hands in thick silk to prevent it from touching your skin. If you dye your skin, quickly wash it with water, and then apply sulfur powder to prevent mercury poisoning from entering your body and harming your qi and blood meridians. When escorting, be light and steady to prevent it from pouring. If it is accidentally poured out, it should be urgently covered with sulfur to make it combine, so as not to cause mercury gas to overflow and hurt people's internal organs.
As for lead, although it is more stable than mercury, it should not be ignored. Lead should be stored in a dry place to avoid water and moisture. It is easy to rust lead due to moisture and damage its quality. When transporting lead, try to avoid heavy pressure collision. Lead is soft and easy to deform under pressure, which affects its use. The equipment used for transportation should be solid and firm to prevent damage to the ground where the lead falls. Handlers should also be careful and proceed in sequence without panic.
And both need to be handled by special personnel. The director must know its nature, understand its interests and disadvantages, and act in accordance with the regulations, and must not make claims without authorization. In this way, the safety of mercury and lead storage and transportation can be guaranteed, and there is no danger of its troubles.