What kind of items have their own "natural enemies", and jade is no exception. Because there are very few indestructible substances in the world, even if they are not afraid of fire, they are afraid of dryness.
1. Fear of the sun. The scorching sun, even the warmth of the items, can not withstand the ravages of the sun. The same is true for jade, to avoid exposure to the sun and direct sunlight. At the same time, jade is also afraid of fire. "The length is close to the fire, and the color paste is retreat." If jade is smoked or roasted, the jade will be damaged, the color will become darker, and even fade.
2, afraid of ice water. "Belong to the ice, the twilight is not alive." If jade is close to ice, the jade will be completely dull, and the color will appear very stiff. This is commonly known as the "dead color."
3, afraid of ginger water. Some people think that using hot ginger water to soak jade can remove the stench. In fact, if jade is soaked in hot ginger water, it will affect the color of jade, making it dull. If the time is long, there will be pockmarks on the jade, and even if it is recalculated in the future, it will be difficult to recover.
Transparency is the expression of matter through the intensity of light. Gemstones and jade have transparency. The transparency of the industry is very important. It is one of the important indicators for testing the quality of gemstones and jade. The term for transparency of a certain material is called “water headâ€. "Dizi Ling" or "Pit Ling"; poor transparency is called "no water head", "land question" or "boring pit", the former indicates that the material is good, the latter indicates that the material is finished. For example, the two emerald colors are basically the same, but the transparency is different. The transparency (head) is many times higher than the quality of the secondary transparency (no head).
Gems and jade absorb light, and because of the amount of light absorbed, gems and jade have varying degrees of transparency. Gems and jade can absorb light, which is a non-transparent body; if not all light is absorbed, it will have various transparency.
In the trading of seed materials, I often hear the words: open the door. So what is the big open door in the seed?
What is meltblown filter?
The main material of melt blown Non Woven Fabric is polypropylene material, which is a kind of ultra-fine electrostatic fiber cloth, which can capture tiny particles such as dust, pollen, germs and so on. For example, after the droplets exhaled by people are close to the melt blown non woven fabric, they will be electrostatically adsorbed on the surface of the non-woven fabric and cannot penetrate. This is the principle that medical masks use meltblown non woven filter materials to isolate germs. Meltblown non woven fabrics have the advantages of high filtration precision, small air resistance, uniform structure, large dust holding capacity and long service life, and are widely used as air filter materials.
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