In the face of today's chaotic jade market, the identification of jade and the quality of the jade is very important for those who want to invest in jade collection. In addition to distinguishing materials, shapes, patterns and crafts, the following "eight inspections" "It is also powerful for you to buy genuine jade."
1, check the fabric fiber marks
Many ancient jade are placed directly on the human body or wrapped in fabric. Under certain temperature, humidity and pressure, the fibers and pigments fall off and firmly adhere to the surface of the object. Therefore, under the microscope, even the naked eye can see the fabric fibers of red, blue, green and other colors, and the latitude and longitude are distinct.
2. Inspect insect eggs and debris
More in the gaps of the ancient jade.
3, check water stains
In the case of relatively stable geological and atmospheric conditions, the underground of the burial ground often has fine submerged flows, flowing and flowing all the year round, infiltrating and eroding the surface of jade, forming fluid, deep and shallow water stains.
4, check the root mark of plants
Some plant roots have the characteristics of pervasiveness. The acidic substances decomposed by the metabolism of plant proteins can cause erosion on the surface of the utensils, so that the root-like prints with clear overlapping relationship can be seen.
5, check carbonization marks
The ancients had the custom of “cavity jadeâ€. The burned jade has the attachment and infiltration of bio-carbon, which is distributed in points and planes. It is often deep and cannot be eliminated.
6, check the "exorcism of minerals" residues (ancient burial custom)
Some minerals in nature have the functions of sterilization, deworming and antisepsis. The ancients thought that they had the effect of driving away evil spirits and placing them in tombs and homes. Therefore, some ancient jade is wrapped or impregnated with mineral powders such as hematite, cinnabar, and realgar. The magnesia or even the naked eye can see the mineral particles remaining on the surface or in the gap of the object. Under the action of hydration and weak acid, the coloring ions From the inside and outside of the table, it gradually penetrates into the interior of the jade, and the color is dazzling. Archaeological discoveries, the cavemen 20,000 years ago, have scattered a large amount of hematite powder in the cave, and also dyed the beads made of limestone into red because of aesthetic needs. In the warring countries of China and the large tombs of the Han Dynasty, there are often a large number of cinnabars and jade articles dyed brightly by cinnabar, such as the tomb of Yue Wang.
7, check the gaps, holes filled with gravel
There are a large number of silica and calcium carbonate minerals on the surface. They can exist and move in the form of liquid or solid gravel. They accumulate in the voids, silicon knots, knots, and are tough, even if they flow into the gap with water. A small stone is also difficult to remove.
8, check the drilling marks
Since the advent of the drill, the drill bit has been essentially conical or diamond shaped. Because it is manpower, the pressure is small, the drilling speed is slow, the non-uniform speed is slow, and the footage is slow. The drill marks appear as reciprocating and relatively parallel movements, and there is a non-uniform swirl pattern. Modern spiral drills do not have parallel drill marks due to high speed and uniform rotation. In the Neolithic Age, the stone-rocking period was similar to that of the ancient drilling tools using metal drills.
In short, the identification and evaluation of ancient jade requires both detailed observation and comprehensive analysis; it is necessary to grasp the microscopic, but also to grasp the essence and the authenticity of the whole, and avoid exaggerating or neglecting the partial. Only by excluding the possibility of each subtle nuance, and then summarizing, deducting and reasoning, and maximizing the combination of sensibility and rationality to think and judge, can we obtain the maximum authenticity.
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