pyridine-4-carbinol

Lead and mercury are often discussed by ancient alchemists, and their chemical properties are special.
Lead is heavy and soft in nature, and gray in color. At room temperature, it is stable and rarely changes, but when it encounters intense fire, it melts into a liquid. It can combine with various acids, and in case of strong heat, it can meet with oxygen to form an oxide of lead. And lead in water and air also gradually changes. Over time, a protective film is formed on the surface, but this film is not firm and difficult to break.
Mercury, like silver beads, flows indeterminately, and is a liquid at room temperature, an anomaly in metals. It is volatile and scattered in the air. If people inhale it, it is more harmful. Mercury can form amalgam with a variety of metals, which is one of its major characteristics. And mercury can quickly combine with sulfur to form mercury sulfide, and the speed of this combination is quite amazing.
Both lead and mercury are toxic. Lead poisoning into the body can disturb people's qi and blood, damage the viscera, especially the liver and kidneys, causing weakness and fatigue, and children suffer from it, which hinders mental development. The same is true for mercury poisoning, which can damage the brain and nervous system, make people tremble, forgetful, and in severe cases endanger their lives.
Ancient alchemists used lead and mercury to change into alchemy drugs, hoping to achieve longevity. However, they do not know the strong toxicity of lead and mercury, and many of them accidentally take it and cause illness or even death. Nowadays, science is flourishing, and it has a clear understanding of the chemical properties of lead and mercury, knowing its advantages and disadvantages. It is also used cautiously in various fields such as industry and medicine to prevent harm to people.

The method of alloying is both ancient and modern. Taking copper-tin alloys as an example, the ancient craftsmen who cast swords and cauldrons all studied their proportions carefully.
Copper-tin alloys, if you want to make tough and sharp blades, copper is the main one and tin is the auxiliary one. If the amount of tin is small, the blade is soft and difficult to break, and if the amount of tin is large, the blade is brittle and easy to fold. In the past, Ou Yezi forged swords, checking the heat, adjusting copper and tin, and made swords, cutting iron like mud, blowing hair and breaking hair. The method, mostly copper ranks seven or eight, tin accounts for two or three, after thousands of tempering, you can get the magic weapon.
The technique of casting cauldrons is different. The tripod is a ritual vessel, heavy in shape and quality, and loud in At this time, the ratio of copper to tin may be copper six tin four. In this way, the tripod body is solid, and the sound of knocking is clear and far away, so as to show a solemn and solemn appearance.
In addition, iron-carbon alloys are also common. In ancient steelmaking, iron was co-refined with carbonaceous materials. Carbon is added to iron to change its properties. If there is less carbon, iron is soft, and it can be used to make agricultural tools. It is easy to forge, turn the soil and cultivate fields, and facilitate farming. If there is more carbon, it is hard, and it can be used to make weapons. It is extremely sharp, and it is very important to kill the enemy on the battlefield to win.
However, if you want to get good steel, it is very important to control the heat and amount of carbon. For example, by pouring steel, pig iron and wrought Craftsmen observe the color of the fire, listen to the sound of iron, and adjust it in a timely manner to make the amount of carbon moderate. In this way, the steel refined has both toughness and hardness, and can be used to refine all kinds of refined steel to create good things in the world. Its function is used in the home country and passed down to future generations.

The use of armor involves a wide range of fields. In the field of military conquest, it is a heavy weapon for soldiers to protect their bodies. In ancient battles, gold, gold, iron horses, arrows and stones are attacked, and armor is added to the body, which can control the blade of weapons and arrows, protect the body of soldiers, make them fearless in front of the battle, and kill the enemy bravely. This is also important in the military field.
As for the hunting realm, hunters also have armor. In the mountains and forests, beasts are fierce, and armor can protect them from the claws of beasts. Hunters rely on the strength of armor to go deep into the forest to find prey, so as to fill the needs of clothing and food. Armor is also useful in hunting.
Furthermore, in the place of ceremonial ceremonies, armor also has a special use. When the Son of Heaven travels, the book is well-groomed, and the soldiers wear armor, showing their majesty and solemnity. In the grand ceremony of the court, there are many armors, and the armor is clear, showing the national prestige. This is for the application of etiquette.
And in the place where the folk practice martial arts, the practitioners sometimes use armor. When practicing martial arts, wearing armor can simulate the actual combat situation, improve skills, and enhance their own protection for emergencies. It is also used in the field of folk martial arts.
To sum up, the use of armor is indispensable in many fields such as military, hunting, etiquette, and folk martial arts. It was an important tool for the ancient people's life and social activities.

Yin and yang are the way of heaven and earth, the discipline of all things, the parents of change, the origin of life and death, and the palace of the gods. Therefore, yin and yang are the fundamental laws followed by all things in the world, and are related to the growth, change, and demise of all things.
Yang, its nature is rigid, active, the main ascension, and the main heat, like the light and warmth of the sun, full of vitality, symbolizing the power of positivity and progress. When the yang is in full bloom, all things flourish and flourish.
Yin, its nature is soft, the main calm, the main descending, and the main cold, like the quiet and cool of the moon, with the characteristics of convergence and nourishment. When the yin is in full bloom, all things are quiet and lurking, allowing them to recuperate.
Yin and yang are opposed to each other and depend on each other. Solitary yin does not give birth, solitary yang does not last long, yang without yin is impossible to transform, and yin without yang is impossible to live. Such as alternating day and night, cold comes and goes, day is yang, night is yin, no day is no night, and vice versa; yang is prosperous in summer, yin is prosperous in winter, the seasons change, yin and yang ebb and flow, and the cycle repeats.
The balance of yin and yang is the key to the stable development of things. Yin and yang are out of balance, and everything is out of order. Yang is hot, yin is cold, and yin and yang are prosperous and decaying, all of which can cause disease. The human body is also divided into yin and yang, the five internal organs belong to yin, the six internal organs belong to yang, and the yin and yang are coordinated to ensure good health.
The physical properties of yin and yang lie in their mutual sympathies and mutual transformations. Yin and yang sympathize, and all things come into being. Under certain conditions, yin can be transformed into yang, and yang can also be transformed into yin, which is the internal driving force for the development and change of things. Just as the extremes of things must be reversed, the flourishing of the extreme will decline, and the veto of the extreme will come, all reflect the transformation of yin and yang.

In the world described in "Tiangong Kaiwu", the storage of silver is related to many conditions. The first heavy place must be a secret, dry and solid place. If it is humid, money and silver are easy to rust; if the ground is not strong, it may be buried by water and soil. If hidden in a secret room and a dark cellar, cover it with thick soil and add masonry to protect it from accidents.
Second, the wrapping is extremely critical. Use cloth and oil paper to wrap it layer by layer. The cloth is soft and does not damage the money and silver; oil paper can isolate moisture and protect it from moisture and rot. There are also wooden boxes that are filled with cotton wool and other things. One is shockproof, and the other is moisture-proof.
Furthermore, the heart of anti-theft is indispensable. In addition to the secrecy of the hiding place, it is also necessary to set up a hidden lock, or fake other things as a cover, so that outsiders cannot find the trace. There are also people who hire people to guard, choose loyal and reliable people, and make their salaries thick, so that they can protect them wholeheartedly.
However, if you store it for a long time, you should also judge the situation. The economy of the world is prosperous and declining, and the value of silver also changes with the market. If you have a time when things are cheap and silver is expensive, you can stock it up for a while; if prices are surging and the value of silver is falling, you should let it out at the right time to avoid losses.
And the way to hide silver is not to hide it all in one place. Scattered and stored, you can avoid the risk of losing everything in the event of a loss. Divided into several places, each has its own way of hiding, one is in trouble, and the other still exists, and the family business will not collapse.
This is the outline of ancient silver storage. Although the years have passed, it means protecting wealth, preventing losses, and responding to changes, or it can still be used as a lesson for future generations.