4- The stone of water, its color is clear. The stone of water is dense and dense in nature, heavy and heavy. Living in the water, the brush of the water, the moon is rubbed, its surface is smooth, the texture is clear, and it is like a natural workmanship.
This stone is in the water, or the pillar, blocks the flow of water, so that the water is urgent. Its color is more blue and gray, and there are also brown ones. The color is due to the immersion of water and water. Its shape is different, or it is like an egg, or the angle is heavy, all caused by the water.
If you use your hands to touch it, the stone surface is slippery, and it feels like it. This is the year of water. And the knocking has a bead, the sound is clear and clear, like a water-containing bead.
The stone of water is a stone of earth and stone, but because of the water, it is special. In the world, the water depends on each other, and we share the wonderful scenery of nature. In the eyes of the craftsman, the material that can be carved, according to its shape, with a new appearance, the beauty of the finished product. In the hearts of the literati, this stone is the water, and it is the principle of nature. It often leads to reverie, and the following articles and images in the book are sent.

"Tiangong Kaiwu" says: "Nitrate and salt are of the same mother, evaporated by moisture under the earth, and now on the ground." This "nitrate" contains 4-tidal nitrate, and the tidal nitrate is sodium sulfate decahydrate ($Na_2SO_4 · 10H_2O $). Its chemical properties are quite impressive.
The first word is solubility, tidal nitrate is easily soluble in water, just like ice crystals entering a warm spring, melting invisible. In water, sodium ions and sulfate ions dissociate and swim freely, making the solution conductive.
Thermal stability is also one of its characteristics. When heated, tidal nitrate first loses crystalline water, just like the molting of silkworms, and the shape gradually changes. Continue to be heated, anhydrous sodium sulfate gradually stabilizes and is not easy to decompose, which is its characteristic in high temperature environment.
Then talk about its chemical activity. Sulfate ions in tidal nitrate can become the key to many chemical reactions under specific conditions. When encountering barium ions, the two embrace each other, resulting in a white precipitation of barium sulfate. This precipitation is insoluble in strong acid, like a stubborn stone. It is often used to test sulfate ions in the tide of stable chemical changes.
When interacting with acid, if tidal nitrate encounters strong acid, it is difficult for sulfate ions to react. Because sulfuric acid is a strong acid, its root ion stability is high. However, when it encounters alkali, sodium ions do not react easily, but in complex systems, or due to changes in ion concentration and pH, a chain reaction is triggered.
Repeat its state in the redox reaction. The sulfur element in tidal nitrate is + 6 valence, which is the high valence state of sulfur and has certain oxidation properties. However, compared with strong oxidants, its oxidation property is weak. Before a specific reducing agent, it may exhibit its oxidation property, which increases the valence state of the reducing agent and decreases its own valence state.
The chemical properties of tidal nitrate are useful in industry, scientific research, and life. Only by knowing it can we make good use of its properties and benefit the world.

4- The main users of this kind of medicine are the same. Those who are well-known materials are important for the use of medical diseases and health care.
In the field of self-care, it has the ability to benefit. If people are sick for a long time, they can take medicine, which can help them correct and consolidate their foundation, so that they can obtain good health, and increase their ability to resist evil. In case of critical illness, they often need first aid, which can be used to save the inverse.
In addition, it is also effective in health care. People today have a lot of life, a lot of energy, and it is easy to cause the body. When taken in doses, it can improve immune function, improve resistance, make the body healthier, and reduce the invasion of diseases. It can also nourish the mind and calm the nerves. It has the effect of improving sleep and calming the mind. It makes the heart calm and the mind sensitive.
And it is also beneficial to the cardiovascular system. It can reduce blood pressure in people with high blood pressure, and restore blood pressure in people with low blood pressure. It can reduce blood lipids, reduce blood viscosity, prevent the formation of porridge hardening, and protect cardiovascular health.
In addition, it also has certain power in beauty. It can promote the new generation of the skin, increase the aging of the skin, prolong the aging of the skin, and make the complexion look good and allow light.
Therefore, it has a wide range of uses, and it has important value in terms of safety, health care, and hygiene.

If you want to make coloured glass, there are many methods, and the ancient skilled craftsmen, each applying a wonderful technique, the following are a few kinds.
One is based on quartz sand, soda ash, and limestone. Take the high-quality quartz sand first, clean it up and mix it with dust, and choose the pure one to use. Soda ash also needs to choose the best quality one, and mix it with quartz sand in an appropriate proportion. The same is true for limestone. The ratio of the three is exquisite, which is related to the quality of the coloured glass. Place it in a crucible and calcine it with a fierce fire. The ancient kiln fire is controlled by the experience of the craftsman. You can observe the size of the fire and the tenderness of the heat. When it melts into liquid, the color is radiant, and it seems to have a brilliant flow, it is appropriate. At this time, a special iron pipe is dipped in the molten liquid, blown in the rotation, so that it becomes hollow, and then shaped by exquisite techniques, or as a bottle, or as a cup, or as an ornament, until it cools and shapes, and the glaze is initially formed.
Second, there are those who use lead Dan to feed. Lead Dan is added to quartz sand and other raw materials to make the glaze more vivid in color and more transparent in texture. However, lead Dan is poisonous, so you need to be cautious when using it. The method of firing it is also different from the previous method. The kiln temperature is more finely controlled. First, it is slowly baked with a warm fire, so that the materials are melted, and then it is gradually heated until it melts. The craftsman is by the side, watching its changes without taking his eyes off. The molten liquid is like golden water, poured into a special mold, and when it condenses, it comes out of the mold, and the shape of the glaze is complete.
Third, among the ancient methods, there are still those who add grass and wood ash. The grass and wood ash is collected from a clean place, and after being screened, it is compatible with other raw materials. This grass and wood ash can help melt, and make the glaze have a unique charm. When firing, different temperature zones are set up in the kiln. The raw materials are preheated at low temperature first, and then gradually enter the high temperature. This is repeated, so that the texture of the glaze is uniform and there are no bubbles and defects. After being baked out of the oven, it is polished, carved and other processes, and finally a beautiful glazed product, or it is emerald-colored like blue, or it is golden and yellow, which is beautiful and eye-catching.

4-Stones need to be paid attention to in the process of storage. First, moisture-proof is of paramount importance. Stones have absorbency, and if they are exposed to moisture, they are easy to dehydrate. If they are placed in a difficult place, they may be destroyed in a few days and lose their original characteristics. Therefore, they should be stored in a place where things are difficult and difficult, and they must be stored to prevent the entry of external water vapor.
Second, the degree of resistance is also controlled. The height or some components of the stone are damaged or biochemically reversed, and they can be transformed into other materials. For example, exposure to the hot sun, or some easy-to-eat materials are scattered, which can affect the quality of the product. Therefore, to avoid high-temperature environments, if the product is suitable, it can be placed in a room.
Third, it is shockproof in the middle of the process. The stone or phase is brittle and hard, and it is easy to be broken due to strong earthquakes. If the road is bumpy on the way, it is not properly fixed to prevent damage, and the stones collide with each other, or are broken into small particles or even powder, which is not conducive to good use. Therefore, the main part of the tool is made of raw materials, and it is necessary to pay attention to the arrangement of the whole layer to prevent displacement and collision.
Fourth, avoid mixing of materials. If the stone is mixed with other chemicals, connected with each other, or caused by chemical reactions, it will stain itself. For example, acid substances should not coexist, because some components in the stone may react, reducing the quality of the product. And keep the material clean to prevent the mixing of materials.