pyridine (reagent)

Those who approach it (sword test), its main use is to sharpen swordsmanship, test the sharp edge and sharpen the mind.
Sharpening swordsmanship is the first priority. The sword is a weapon, and the level of swordsmanship is related to the safety and victory of the swordsman. By sharpening the sword test, the sword move can be more skilled and sharp. The swing of the sword pays attention to the combination of firmness and softness, and the reality coexists. In the process of sword test, the swordsman can perceive the weight and length of the sword, conform to the characteristics of the sword, and make the sword move more smoothly and naturally. For example, "The sword is like a flying phoenix, fast but not chaotic; the shape is like a flood dragon, moving and orderly", after repeated sword tests, this state of exquisite swordsmanship can be achieved.
It is also very important to test the sharp edge. The sharp edge of the sword is the key to killing the enemy and winning. Whether the sharp edge is sharp or not directly affects the lethality of the sword. Test the sword with different materials, such as wood, stone, leather, etc., to observe the cutting and piercing ability of the blade. "The sharp blade breaks gold, but the iron is cut like mud". A sharp blade can make the enemy undefensible in actual combat. When testing the sword, observe whether the blade is broken or rolled. If there is such a situation, it needs to be polished and repaired in time to ensure the best performance of the sword.
Sharpening the mind is the deeper cost of testing the sword. Testing the sword is not only a test of skills and weapons, but also a test of the mind. In the face of the sharpness of the sword and the dangers that may arise, sword practitioners need to remain calm and calm. During the process of sword testing, or in the event of unsatisfactory sword moves or damaged blades, they should not panic or be discouraged at this time. When you have a peaceful heart, analyze problems and seek solutions. Only in this way can you be calm in actual combat, deal with various complex situations with a calm state of mind, and make swordsmanship play to the extreme.
To sum up, those who follow it (sword testing) have important uses in sharpening swordsmanship, testing the sharp edge and sharpening the state of mind. The three complement each other and jointly improve the ability and realm of sword practitioners.

The physical characteristics of a certain medicine (reagent) can be divided into the following numbers.
First, looking at its shape and quality, this medicine is often in a state of condensation but not dissipation, or like crystal jade, or if the plaster is warm and moist. Its color is also different, or pure like snow, or slightly colored, but they are all clean and impure. Looking at it, you can see that the texture is excellent. To touch it, it feels smooth and delicate, without the feeling of rough and stinging, just like silk brushing against the skin. Its texture is unique, and it seems to have both agility and calmness.
Second, when it comes to smell, get close and smell it lightly. When you first smell it, there is a wisp of fresh air, light but not thin, quiet but not greasy, like a new flower blooming in the mountains and forests, and like the dew that rises in the morning, giving people a feeling of freshness. Under the fine product, there is a trace of heavy taste, like the fragrance of aging, which vaguely reveals the charm of precipitation over time, as if telling the deep medicinal power contained in it.
Third, with regard to its solubility, put this medicine in various common solvents, and it can gradually melt and disperse in water. Like mist dissolving in the breeze, it quietly becomes one, and the water liquid becomes clear and uniform. It can be seen that its affinity with water is quite good. It can also be dissolved in wine, but compared with water, the speed of dissolution is slightly slower. After dissolving, the color of the wine changes slightly, and the aroma is more mellow. It seems that the two blend together, adding a different style. In case of oil, although it cannot completely dissolve, it can partially blend with it, forming a unique mixed state, showing the complex performance of its physical properties in different media.
Fourth, consider its stability. Under normal conditions at room temperature, this medicine can maintain its inherent shape and properties for a long time, does not evaporate and dissipate easily, and does not have obvious chemical reactions with the surrounding air and moisture. It is like a calm old man who keeps his time without changing his quality. Even if there is a change in temperature, it can maintain relative stability within a certain range. Only when the temperature is too high will the properties change, or gradually melt into a liquid, or emit a peculiar fragrance, which also shows its tolerance to temperature.
The physical characteristics of this medicine are all key elements in the pharmacology of medical medicine, and it is important for doctors to observe it when it comes to its efficacy and usage.

When hiding things, you need to pay attention to everything in order to keep them intact.
Where you hide things, it is first and foremost dry. If you are in a humid place, things are prone to mildew and rot. Gu Yun: "Damp is evil, and nothing is invincible." For example, silk and silk, if placed in a damp place, mildew will not be seen for a long time, which will damage its color and texture. Therefore, where you hide things, you should choose a high and dry place, or put lime and other moisture-absorbing things to remove moisture.
Furthermore, insect prevention is also a priority. Silverfish, clothing fish, etc., are good for eating clothes and books. The ancient Tibetan classics often used rue grass in them to repel insects with its aroma. Although there are various anti-insect agents available today, one should be cautious when using them, and do not stain the contents. And the hiding place should be inspected frequently, and if you see insect marks, remove them immediately.
Avoid light and do not ignore it. In sunlight, ultraviolet rays and other easily-causing substances fade and age. Such as calligraphy and painting, if they are often exposed to sunlight, their color will fade, and paper silk will become brittle and vulnerable. To hide such objects, it is advisable to cover them with a curtain, or place them in a dark room.
The utensils of hiding objects are also exquisite. Metal objects should not be placed with materials that are prone to chemical reactions. If iron and bronze utensils are co-located, they will rust for a long time. The cabinet of hidden objects is preferably made of wood, but it is also necessary to prevent its own decay and insects from eating it. And the cabinet should have a lock key to prevent idle people from flipping it at will.
When handling hidden objects, the action should be gentle. If you act recklessly, fragile objects are in danger of being damaged. Treasure jade, tentacles need to be steady, when moving, be extra careful not to collide.
In short, the way of hiding objects requires careful attention to drying, insect prevention, light protection, hidden objects and handling, so that the hidden objects can be kept intact as the years go by.

The deployment of safety protection when using it (the test drug) is related to human life and pharmacology, and should not be ignored. The following is based on the ancient law to describe all kinds of protection.
The first priority is the cleanliness of the environment. "Tiangong Kaiwu" says: "At the beginning of creation, one must seek to cleanse the place." The place where the medicine is tested should be wiped frequently to remove all filth, so that there is no dust, insects and ants. Doors and windows should also be tightly closed to prevent external evil from entering the inside and damaging the nature of the test drug.
The second is the cleanliness of the utensils. "If you want to do good work, you must first sharpen its tools." The utensils used, such as kettles, tripods, spoons, and bowls, must be washed with clean water, and then burned with fire to remove the old filth and keep it pure. Do not mix the residue of the former medicine with the newly tested medicine, causing the drug to mutate.
Furthermore, the protection of the tester. "The body is a boat carrying the Tao." The tester wears a towel over his head in front of clean clothes to prevent the hair from falling into the medicine. Hands must be washed or wrapped in cloth to prevent the dirt of the body and skin from touching the medicine. If you try a poisonous medicine, you need to prepare an antidote on the side to prevent accidents.
Repeat, the order of the test medicine. "Things have a beginning and an end, things have a end." Test it in a small amount first, and observe its initial effect. Wait for the drug to appear slightly, and then increase it as appropriate. Do not use a large amount suddenly, causing serious trouble. And when testing the drug, remember its reaction, time, and symptoms in detail for reference.
There is also the need to observe. "Check the color and follow the pulse, and first disregard yin and yang." When testing the drug, pay attention to the changes in the color, taste, and qi of the drug, as well as the expression, complexion, and pulse of the tester. If there is a slight abnormality, stop the drug test quickly, investigate the cause, and find countermeasures.
Such various safety protection arrangements are all essential for testing the drug. Following them can ensure the safety of the drug test and lay a solid foundation for the progress of medicine.

The chemical properties of this medicine (test pill) are quite complicated. Its nature is warm and moist, although it does not have the dryness of fire or the cold of ice, it is in a neutral state.
Looking at its properties in water, it is soluble and fast, just like snow falling on a lake, disappearing in an instant, turning invisible, and fusing with water, which shows that it is hydrophilic. It can also be slightly soluble in various common organic solvents, but its solubility is slightly less than that of water, which shows its affinity for different solvents.
When it comes to thermal stability, when it is heated slowly with a small fire, there is no pungent smell, and there is no drastic change. Only the shape is slightly softened and not melted. It can be seen that its heat resistance is quite good, and it is not easy to make qualitative changes. However, if the fire is too fierce, it can also gradually melt, and eventually disperse into smoke. This is due to excessive heat and the destruction of the chemical structure.
When encountering acid, there seems to be a slight blue, slightly bubbles, such as the spit of a fish. This is the appearance of a chemical reaction, forming new substances, and its properties change accordingly. When it comes to alkali, the reaction is more peaceful than when it comes to acid. Only the surface color of the drug body changes slightly, but the texture does not change greatly, which shows that the degree of reaction with acid and base is poor.
This drug (test pill) is under light, and its color gradually darkens, like a dark night occultation. However, the change of its chemical properties cannot be observed for a long time. It needs to be observed for a long time to know the shadow of light on its structure. It is also placed in the air, and after ten months, it has not been invaded by moisture, nor has it rust and rot with oxygen. It can be seen that it is in normal air, and its stability is quite high. < Br >
Its chemical properties are both stable and variable, and when encountering different substances, the reactions are different. It is suitable for medical pharmacology or can be used according to its nature, and is helpful for treating diseases and treating diseases.