In the current jade market, many merchants in the jade shop are introducing the white jade they sold, saying that this is a sheep fat jade, or reaching a sheep fat. As everyone knows, this view of the merchant is very incorrect and misleading. Of. The real sheep fat jade is very rare, and its price is very expensive. In fact, the term "Yanzhiyu" is actually a relative concept, not an absolute quantification in our imagination. The description we usually use is the first grade white jade, the texture is very delicate, and the structure is very uniform. When this description is when the side is illuminated by hand, it feels almost nearly a kind of crystalless structure. The characteristics of the shape, radish flower, or the feeling of a loose structure, it is very delicate and clean. Another one is that the kind of white is not what we usually call pure white, nor white that is whiter than paper, sometimes with a touch of cream, it is a very gentle white, let people I saw very comfortable white. There are also some sheep fat jade that has a faint green color, and the introverted light gives a slightly cold feeling from the inside out, commonly known as "cold beauty." The reason why it is called Yangzhiyu is because of the oily and gentle, gentle, elegant and noble feeling in the fat of the sheep. However, unlike our imagination, in our Xinjiang gemstone quality supervision and inspection station, there is no quantitative and objective scientific scale for the evaluation of Yangzhiyu. Even national experts are judged by Yangzhiyu. The naked eye and its own experience. So, from a certain point of view, sometimes it is a scale of experience, not a pure physical or chemical scale, such as chemically testing the amount of silica, physics, we It is not a strict scientific scale to say how much density it has and how much it has. It is a scale of experience. We also evaluate this experience and then take this empirical value and its theoretical value from empirical data. When it comes up, it produces a new piece of data, which in turn uses this data to control this experience, not the precision instrument we imagined. However, in reality, almost all jade shop merchants show their identification certificates of sheep fat jade that are basically issued at the provincial level, and there are also certificates issued by the state. In fact, some of the quantitative test data in these certificates are based on a set reference value, including color, optical characteristics, internal characteristics, refractive index, absorption spectrum and long-wave, short-wave in the ultraviolet spectrum. When testing a piece of jade, the value set by the testing instrument is reached, then it is identified as sheep fat jade, and if it is not, it is Hetian jade or Hetian Baiyu. But most of us in the eyes of our true collectors and players do not recognize this result. Therefore, the real sheep fat jade is not entirely a certificate that sheep fat is true sheep fat, can only say that the indicators reach the fat jade. In the identification of sheep fat jade, experience and eyesight are especially important. There are thousands of kinds of agate and jade, and the different whiteness and moistness of the different fat jade will be slightly different. The seed jade is not repeated, and each piece is different. Unlike diamonds, which can be measured by whiteness, but the whiteness of Xinjiang Hetian Yangzhiyu is not the same, so I am not afraid of not knowing the goods, I am afraid that the goods are better than the goods, two pieces of jade are placed together, you feel This is quite white, and it is a white one. It is whiter again, and it is white. The diamond didn't know how much it cost at the time (standard), but it was a crystal after all, but Hetian Yuzhong, each piece is different, the texture, oiliness and fineness are not the same, relying on It is completely experience. As we all know, the white fat white jade is a gem-grade material of Hetian jade. It is the best of white jade in pure white color. It has the best luster and texture. It is characterized by warm and firm, pure and pure, white and flawless, like gelatin. It is delicate and thick, has a mature phase, and has excellent oil and fat. It is like a group of sheep tail oil that has just been cut. This is impossible for other jade materials, not just whiteness. Therefore, the good sheep fat jade must first look at its delicate thickness and maturity, the whiteness is second, the white material, the fleshy quality is loose, the toughness is insufficient, the carving can not stand the knife, the details can not be played to the extreme, Therefore, the real suet jade is that the internal structure cannot be seen with the naked eye under normal light. In our collections, there is a view that sheep fat is red, yellow or pan-green in the white, and there is also a view that there is a sheep fat jade in the main seven colors of Hetian jade, which is not an exaggeration. As for the white in the sheep white jade, it must be white, white and cool white. The pale and white are naturally not recognized. Therefore, the higher the maturity of jade, the greater the possibility of becoming a fat jade. The maturity is the most important indicator in determining whether it is a sheep fat jade. Moreover, the white fat of the sheep fat is not necessarily whiter. There is a strange phenomenon in the jade collection nowadays, that is, the pursuit of whiteness blindly, while ignoring other factors, in fact, this collection concept is wrong, and the author does not agree. The so-called sheep fat white jade is the metaphor of people's best for Hetian jade. In addition, the color of Hetian jade is not exactly the same, so the so-called sheep fat white jade can never be scientifically fixed with a fixed standard. Determination. Many people in the industry think that the white fat is not pure white, but white with grease luster. Some of the whites may have a slight yellow or cyan color, and the slightly poorer texture may also give a slight light gray tone in the white. Nowadays, the practice of people aligning themselves with white is obviously a misunderstanding of sheep fat white jade, which is unscientific. In fact, the fat white jade is just the name of the people nowadays. In the past, it was called Yangzhiyu. There is no such thing as a white word. This white word is added after people, with too many subjective colors, so over-emphasizing color will greatly mislead people's collection ideas. In reality, if we use the fat and whiteness of the sheep oil we eat, then there may be only one piece of white fat in the world. Because sheep oil has only one whiteness and one oiliness, and the color of each jade of Hetian jade is not exactly the same, so we can't force it. It is necessary to seriously and realistically deny the current popular saying and the standard of choice for sheep fat jade. Therefore, because people have different criteria for color determination, so whether it is white enough or not a scientific quantitative standard, it is only judged by experience alone. The author once saw Hetian jade, which is very white in the Palace Museum, but the experts classified it as sapphire. And a piece of ancient jade that looked blue was included in the white jade. Therefore, the author suggests that the vast number of collectors should not regard the saying that the white and white of the sheep fat white is better. If only white is emphasized and the texture is neglected, many quite white stones like marble and quartz will become jade. Finally, the author wants to say: the mystery of sheep fat white jade is not a good thing, what is sheep fat white jade? Because there is no uniform standard, most collectors do not recognize the standards of the appraisal center. What to do, then the moderation is to classify the sheep fat white jade, so that everyone has the heart of the white jade, the eyes are higher than the sheep white jade Less, the eyesight is lower than the fat white jade. But as time goes by, the more real things you get started, the higher your vision will be. The higher your vision, the less sheep fat jade in your eyes, then you are also in the way! ! ! Sheep fat white jade, as the name suggests, is like jade (commonly known as sheep oil) jade, then it must be white first, of course, it will not be white like white porcelain. Most whites will have a bit of color, and it cannot be said that a little faint color is not a sheep white jade. The interpretation of modern gemologists is: high-quality white jade, its color is white or white, slightly light blue, milky yellow, etc. The texture is fine and moist, the oil is good, and there are a few stones and other impurities. Popular description: If the concept of white jade is a university, sheep white jade is a key university. Mr. Xia Wei, a famous archaeologist in the country, once said in the article: "The jade material of the Han Dynasty... the milky white jade jade has increased greatly." The physical proof refers to the sheep fat white jade produced in the Western Region of the Han Dynasty. The white fat white jade crystal clear white, delicate and moist, but less sputum, "white as a fat." Its characteristics are that it is particularly delicate, bright and warm. The finest white fat white jade is almost innocent, like the fat of the fat mutton that has just been cut, and the gloss is just like the fat of the condensed. In fact, most of them have different cracks or a few impurities, so the jade is called cracking or smashing. Generally, the cracks and the more obvious impurities are fixed at the time of work, and the existing small cracks are in the normal range without affecting the appearance of the jade and its firmness. Sheep fat white jade belongs to the high-quality variety in white jade. Just like the description of "snow sugar orange", it is a kind of white jade. The quality of ruby ​​in gemology is also known as the "pigeon red treasure." The hardness of sheep white jade is 6-6.5, second only to jade. The toughness and wear resistance are the strongest in jade, the texture is dense and the chemical properties are extremely stable. It has not been completely tainted for thousands of years, but it is not unreasonable. The unearthed artifacts are not as white as they were originally. This is not a defect, but the characteristics of the ancient jade. The jade of white jade white jade is soaked in the groundwater of the wasteland or oasis in the Kunlun Mountains for thousands of years. Its texture is hard and dense, and it is as gentle as it is at the beginning. It is stronger than steel in the shape of gentle and soft white. The tenacity is also the value of its value. White jade is divided into "ziyu" and "mountain material" and "mountain stream". The so-called "ziyu" was taken from the Yuhe River in the Kunlun Mountains. This kind of "ziyu" is hard and dense, delicate and moist, and lustrous like fat. The ancients described it as "often dyed by fat." Some "ziyu" have long-term immersion in the sand containing groundwater and have various colors of leather. This kind of "ziyu" is characterized by the fact that it is not found in mountain materials. There are also many white and white fats such as fat in the mountain material, and the yield is dozens of times that of the sub-materials. According to the materials of archaeological discoveries, as early as 3,500 years ago in the Yin Shang period, the jade produced in Kunlun Mountain has been introduced into the Central Plains. After the Spring and Autumn Period and the Warring States Period, Hetian jade gradually became the main jade used by the emperors and nobles of the past, most of which were collected materials. By the end of the Yuan Dynasty, the mountain material was used. After the Qing Dynasty, the output of the mountain material had greatly exceeded the material. Sheep fat white jade has been highly valued since ancient times and is the best in jade. It is very precious. It not only symbolizes the gentleman's character of "benevolence, righteousness, wisdom, courage, and cleanness", but also symbolizes the secular feelings of "beautiful, noble, auspicious, gentle, and comfortable." In ancient times, the emperor was qualified to wear white jade. Archaeological facts have confirmed that the jade used by many ancient emperors is a special white jade. Among the treasures of museums in many localities, the historical relics carved from white jade and jade are not regarded as "national treasures". For example, the Western Han Dynasty "Queen of the Queen" unearthed is made of crystal clear and pure white sheep. The fabric is light and thin, the drape feeling is good, the modeling line is smooth, and the clothing contour is naturally stretched. We often use straight-line shape in clothing design of this kind of clothes, which reflects the graceful curve of human body and the flowing sense of fabric lines. 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