The main use of the notes in the three provinces and a land is also related to the writing of letters and letters, the exchange of letters, and the creation of calligraphy and painting.
Viewing the ancient age of the husband, the transmission of documents depends a lot on the notes. The official and the official wrote and studied, so as to be in front of the king, to describe the political situation, the gains and losses of advice, and to the safety of the society; the scholars submitted the papers, with this to show their talents and learning, hoping to be promoted, so as to fulfill the aspirations of the green clouds. As for the people, although it is not as solemn as the court, the exchange of letters also relies on it to communicate family feelings and friendship, and pieces of paper are full of thoughts and concerns.
When it comes to calligraphy and painting, the use of notes is particularly delicate. The painter's move, the texture of the paper, the softness and hardness of the pen, are all related to the expression of brushstrokes and the rendering of ink rhyme. A good note can make the agility of the landscape, the beauty of the flowers and birds, and the charm of the characters appear on the plain note. The calligrapher moves the pen, the note is smooth, and the stroke is as far as the stroke goes, between the strokes and paintings, the beauty of calligraphy is fully displayed, or elegant and free, or strong and vigorous.
And the system of the note also contains the ingenuity of the craftsman. The materials are well selected and the craftsmanship is complicated to achieve the best effect of writing and painting. This is not only practical, but also for the inheritance of cultural skills, so that the elegance of the millennium can continue endlessly. Therefore, in the cultural inheritance, interpersonal communication, and artistic creation, it is indispensable.

Aluminum triethylphosphonate is an organophosphorus fungicide. Its physical properties are as follows:
Looking at it, aluminum triethylphosphonate is a white crystalline powder, like fine snow, with a fine texture, as far as the eye can see, pure and free of variegation. In the hand, it feels soft to the touch and smooth like a powder.
Smell it, this thing is almost odorless, and if you smell it closely, you can only feel a very light smell. There is no pungent or choking smell. In the daily use environment, it will not cause discomfort to the user due to the smell.
When it comes to solubility, aluminum triethylphosphonate is soluble in water, put it into water, add a little stirring, and then slowly dissolve to form a uniform solution. This property makes it convenient to prepare different concentrations of liquid, suitable for various application scenarios. In common organic solvents, such as ethanol, acetone, etc., its solubility is poor and it is difficult to dissolve. This characteristic also determines that in the preparation process, the appropriate solvent or auxiliary agent should be selected according to its solubility.
Furthermore, the melting point of aluminum triethylphosphonate is quite high, and it needs to be converted from solid to liquid under specific high temperature conditions. Such a high melting point allows it to maintain a stable solid state in conventional storage and transportation environments, and it is not easy to melt and deform due to temperature fluctuations, which is conducive to long-term and stable storage and circulation.
In addition, aluminum triethylphosphonate has good stability. In normal temperature and humidity environments, its chemical structure is not easy to change for a certain period of time, and it can maintain its original bactericidal activity. However, if it is exposed to high temperature, high humidity and long-term extreme environments, it may slightly affect its stability, causing the active ingredients to decompose. Therefore, it should be stored in a dry and cool place to ensure its quality.

There are many ways to synthesize triethylbenzene. In the past, all parties showed their ingenuity, and they have achieved such a wonderful method.
One method is to use phenyl group, and then add acetylation. Make the phenyl acetyl chloride, using water trichloride as a catalyst, and then react. This is the principle of the substitution of acetyl group to benzene, which is attached to benzene, to obtain monoethylbenzene at first. If you want to obtain triethylbenzene, you need to adjust the product, increase the amount of acetyl chloride, increase the reaction, and extend the reaction, so that more ethyl groups can be added to benzene, and the multi-step substitution can be used to obtain triethylbenzene.
There are also those who start with benzoic acid. First, benzoic acid is oxidized to give benzyl alcohol, and then oxidized to give benzaldehyde. Then, benzaldehyde and acetic anhydride are used, and under the catalysis of acetic acid, the reaction is carried out, and the medium product is obtained. This mixture is then synthesized like a compound, such as the increase of the group and the acyl group, and triethylbenzene can also be obtained. The first step requires precise control of the compound, so as to ensure the quality of the compound and the best yield.
Another starting material is phenol. Phenol can be used to protect the group, masking its active group and preventing it from reacting. And the benzene can be acetylated, deprotecting the group, and then oxidizing and substituting, and gradually changing the triethyl group. In this method, the use and retention of the base need to be carefully selected according to the needs of the reaction, and the conversion rate and performance of each step need to be carefully controlled to obtain the best product of triacetylbenzene.
The method has its own advantages and disadvantages, and those who need to consider the ease of raw materials, the cost, the ease of workmanship, and the requirements of materials, etc., can only be used in the synthesis of triethylbenzene.

Sanxiang methylarsenic, a highly toxic thing, is dangerous to hide and transport, so you need to pay great attention.
When hiding, the first thing is secrecy and safety. You must find a remote and rare place to prevent accidental leakage and harm to innocent people. There should be no water source around, because arsenic is highly toxic. If it leaks near the water source, the water will be poisoned, and people and animals will drink it, causing great disaster, involving countless living beings. Do not mix it with other things, especially those who can react with it, otherwise it may cause changes in toxins, more toxicity, or cause accidents, causing poison to spread.
When you are in transit, you need to choose someone who is proficient in this matter. He must be well aware of the harm of arsenic and act calmly and carefully. The utensils used must be solid and not leak, and they must be tightly sealed, so that there is no danger of arsenic escaping. During transportation, the pace should be steady, and bumps should not be bumped and collided to prevent the utensils from being damaged. On the road, avoid places with many people, such as markets, villages, etc., just in case there is any loss, poison will be scattered and hurt.
Furthermore, all Tibetan transportation should be done in secret, and it should not be made public. If it is known to others, or if you are coveted for life, you plan mischief and cause arsenic to fall into the hands of the wicked, it will become a serious disaster and endanger the peace of one party. And in the process of Tibetan transportation, you should be prepared for rescue. In case of accidental leakage, you can also deal with it in time to reduce its poison. In short, the transportation of Sanxiang methylarsenic is related to the safety of life and local disasters and blessings. It is necessary to be cautious in order to be comprehensive.

The market price of Dendrobium sanxiang nail piece is difficult to determine, because of various factors.
First, the distinction between the quality and the first is crucial. Those who are of high quality have complete shape and pure color, positive taste and good effect. Such Dendrobium, the price must be high. Or up to a thousand gold, or even higher. And those who are slightly inferior in quality have miscellaneous color, taste or light, and the effect is not complete. The price is far from the same, or only a hundred gold left and right ears.
Second, the difference in production is also related to the price. Born in a land of beautiful mountains and rivers, abundant water and soil, absorbing the essence of heaven and earth, nourished by nature, its quality is extraordinary, and the price is not cheap. However, although it is produced in ordinary places, it is also Dendrobium, and the price cannot be compared with it.
Third, the supply and demand of the city determines its price. If everyone pays attention to health and seeks Dendrobium to adjust their health, there are many people who need it, but there are few who produce it, the price will rise. On the contrary, if the supply exceeds the demand, the price will drop.
Fourth, the way of sale is also different. In the market, through layers of resale, the price may increase. If it is directly in the hands of mountain farmers, without all kinds of setbacks, the price may be slightly cheaper.
Roughly speaking, the high-quality Sanxiang methyl Dendrobium is worth about a thousand dollars in the market, the middle one is hundreds of dollars, and the low one is within a hundred dollars. However, these are all approximate, the market conditions are fickle, and the price also moves from time to time.