Thiophene, 2,3,5-tribromo-

"Tiangong Kaiwu" says: "Alum is a metal-colored stone, and there are five types, called green alum, yellow alum, black alum, bile alum, and alum. In today's words, two, three, and five alum are called alum, bile alum, and green alum."
Alum, its chemical properties are potassium aluminum sulfate crystalline hydrate, chemical formula $KAl (SO_ {4}) _ {2}\ cdot12H_ {2} O $. Sour, cold, toxic. It has the effect of detoxifying and killing insects, drying dampness and relieving itching, hemostasis and diarrhea, clearing heat and eliminating phlegm. It is also useful in industry, such as when purifying water, it can be used as a flocculant to make impurities suspended in water settle. < Br >
Choleum, that is, copper sulfate pentahydrate, chemical formula $CuSO_ {4}\ cdot5H_ {2} O $. Color blue, sour taste, pungent, cold, toxic. Commonly used in agriculture, with Bordeaux liquid to control agricultural crop diseases. In chemical experiments, it is a common reagent and can be used to test the existence of water, because it changes from white to blue in contact with water.
Green alum, ferrous sulfate heptahydrate, chemical formula $FeSO_ {4}\ cdot7H_ {2} O $. Color green, its aqueous solution is light green. It is easily oxidized in the air, so it needs to be sealed and stored. It can be used as a blood tonic in medicine, and can be used in industry to produce iron salts, water purifiers, etc.
Although these three kinds of alum are all salts containing crystalline water, they have different chemical properties and different uses due to different metal ions, and are of great value in various fields such as industry, agriculture, and medicine.

Saltpeter, sulfur, and charcoal are the foundation of gunpowder, and their physical properties are different. Here is a detailed description.
Saltpeter is white and like frost and snow, cold in nature. Its taste is salty and slightly bitter, and it is easily dissolved in water. When dissolved, it can cause the water temperature to drop sharply, as if absorbing the surrounding heat. Its crystals are often needle-like or columnar-like, polymerized and formed, with a clean and radiant appearance.
Sulfur, yellow as gold in color, has a special odor. It is brittle and light, and fragile to the touch. Its melting point is quite low, and it melts into a liquid state when heated to hundreds of degrees, and the color becomes darker and sticky. When burned, it emits a blue-purple flame, accompanied by pungent smoke. This cigarette is highly irritating and can make people cry.
Charcoal is black and light, porous and loose. Its density is less than that of water, so it can float on the water surface. Charcoal has strong adsorption properties and can absorb odors and impurities. When burned, it generates heat. The flame is red. Although it does not have the pungent smell of sulfur or the cold characteristics of saltpeter, it provides stable heat during combustion and provides the necessary fuel base for gunpowder combustion.
Of these three, saltpeter mainly provides oxygen, sulfur supports combustion and adjusts combustion speed, and charcoal is the fuel. The three complement each other and are combined in appropriate proportions to make a powerful gunpowder that is of great use in military, civilian and other fields. The cold of saltpeter, the smell of sulfur, and the black of charcoal have different physical properties, but they can be combined into a wonderful thing. This is the wonder of creation and the evidence that human wisdom uses physical properties.

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, and the book has unique insights in many fields of technology. The main uses of 2,3,5-triazine are expressed in classical Chinese as follows:
Fu 2,3,5-triazine, its use is quite extensive. In the dyeing and weaving industry, it can be used as a dyeing aid to help dye evenly, so that the color of the fabric is uniform and bright, and it can increase its color fastness. It does not fade over time, just like the color of spring flowers, and it lasts for a long time.
In the road of medicine, it also has important functions. It can be a key intermediate for drug synthesis. With its special chemical structure and ingenious reaction, it can produce a variety of medications with good curative effect, or it can eliminate diseases and save people from pain, just like the elixir of the holy hand of the apricot forest.
In the field of agriculture, it can be used to prepare high-efficiency pesticides. It can accurately kill pests, protect crops to thrive, and ensure the harvest of grains. It is like a loyal guard in the field, resisting the invasion of pests, making the wheat waves in the field turn gold and the ears of rice droop.
In addition, in the field of materials science, it can participate in the synthesis of high-performance materials. For example, it is used to prepare special plastics, making the material have better heat resistance and corrosion resistance, suitable for harsh environments, like a strong barrier, to increase the durability of equipment, appliances, etc., and is widely used in various industries to help the device to be durable and benefit people's livelihood.

If you want to make two, three, five-three baht utensils, the method is as follows:
Prepare good materials first, and copper and tin must be fine. Copper takes its redness, and tin seeks its whiteness. The ratio of the two is related to the quality of the utensils. In the past, for coinage, two baht, copper accounted for seven, and tin accounted for three; for three baht, copper six tin four; for five baht, copper five tin five. This ratio is not static, and it is fine-tuned according to the craftsman's skills and the needs of the time.
At the beginning of the casting of utensils, first melt copper and tin. Place the copper in the crucible and burn it with charcoal fire. The bellows are billowing, and the fire is hot. When the copper melts into a liquid, it looks like a red flow, and then When melting the liquid, the heat is the most critical. If the fire is weak, the copper and tin will be difficult to melt, and if the fire is fierce, the metal will be vulnerable. Look at the color of its flame, smell its metal gas, and the craftsman can control the heat with experience.
After melting, pour the liquid into the fan. The mold of the casting tool is also made of clay or bronze. It is engraved in the shape of two, three, and five baht, which is fine and subtle, and the text pattern is clear. Pour the liquid into the fan smoothly and quickly, do not splash the liquid, and do not pour it too slowly to cause the liquid to solidify.
Wait for the liquid to cool in the fan. It is still hot at first, and do not move rashly. Wait for it to cool through, and be careful to unmold. At this time, although the tool is shaped, it may < Br >
Then repair it with a file and a grindstone. File off the rough edges and grind the surface to make the utensil smooth and flat, with clear handwriting patterns. When grinding, the force should be uniform, not too deep or too shallow, so as not to damage its shape.
After these several processes, two, three, five-three baht utensils can be made. Every step in between requires the attention of the craftsman. If there is a slight difference, the utensils will not become high-quality products.

In the two, three, and five-trijiao-reaction, the common side reactions are as follows:
First, heat evil hurts the body. Trijiao is the channel for the running of water and liquid. If evil heat is contained internally, burnt and burnt trijiao, it is easy to cause damage to the body fluid. If the evil of warmth invades and transpires the body fluid, it can cause thirst, dry throat, short red urine and other diseases. "The theory of heat" says: "Warm evil is affected by the lungs first, and the pericardium is reversed. The lungs dominate the qi, and the heart dominates the blood. Although the qi and blood of Yingwei are the same as typhoid fever, if the treatment law is very different from typhoid fever." The evil of warmth transforms and changes, which can often damage the body fluid of trijiao and affect the metabolism of water.
Second, the internal resistance of moisture and turbidity. Three coke gasification loss, water and liquid metabolism is abnormal, and it is easy to cause moisture and turbid endogenesis. If moisture and turbid block the middle coke, you will see abdominal swelling, nausea and vomiting, and loss of appetite; if moisture and turbid bet on the coke, you will see turbid urine, edema of the lower limbs, etc. "Su Wen · Zhizhen wants to talk about it:" All dampness and swelling belong to the spleen. "The spleen occupies the middle coke, which is the hub for transporting and converting water and dampness. The gasification of the three coke is unfavorable, and the moisture and turbid are easy to trap the spleen and soil, which in turn aggravates the appearance of internal resistance of dampness and turbid.
Third, the qi is stagnant. The three coke is the channel for the lifting and lowering of the qi. If the evil gas blocks the three coke, If the mood is not comfortable, the liver is stagnant and qi stagnant, and the qi stagnation turns into fire, it can affect the Sanjiao qi machine, and there will be chest and flank fullness, emotional depression, belching and sighing. "Lingshu Meridians" says: "The veins of liver and foot jueyin... It is a disease of movement, and the lower back pain cannot be pitched. The husband has a feeble hernia, and the woman has less abdominal swelling, even dry, and the face is discolored." Liver qi stagnation can be reversed along the meridians, affecting the smoothness of the Sanjiao qi machine.
Fourth, phlegm drink is endogenous. Sanjiao gasification is abnormal, and the water stops gathering, which can condense into phlegm drink. Phlegm drink stays in different parts, and different symptoms can appear. If it stops in the lungs, it coughs, wheezes, and expectorates; if it stops in the chest and flank, it is full of chest and flank, and the cough and saliva lead to pain; if it stops in the stomach and intestines, the intestines are ringing and leaking sound, vomiting water and phlegm and saliva. "Golden Chamber Strategy · Phlegm Drinking and Treating the Syndrome of Phlegm Drinking" discusses the syndrome and treatment of phlegm drinking in detail, such as "The person is prosperous and thin, the water goes through the intestines, and the drain has a sound, which is called phlegm drinking; after drinking, the water flows under the flank, and the cough and saliva lead to pain, which is called hanging drinking; drinking water is popular, and it belongs to the limbs. When sweating but not sweating, the body hurts heavily, which is called overflowing drinking; if you cough and rely on the breath, you can't lie down