The identification of Gao Guyu can be said to be a hundred schools of thought and a hundred flowers. For the identification of high ancient jade articles throughout the country, because of the different land points of jade, its characteristics are different, so the identification methods are different. 1, broken old and new: the calcification and ochre transition of the utensils should be natural, and deep into the texture, the color change is rich and colorful. For a short time, it will never be the case. The color will only be attached to the surface shallowly or along the jade crack, and the color will be unchanged. As long as it was the calcification of the jade before the Song Dynasty, it was affected by the phenomenon. 2, look at the pulp: in addition to being corroded, the ancient jade will have a pulp, the surface of the jade emits a very soft luster. Most importantly, the patina in the punching and completion should be consistent with the outer patina and integrated. Some will also have localized oxidized protrusions at the same time. 3, smell odor: unearthed jade, put it on your mouth and gently exhale or soak it in warm water for a while, put it on the nose and smell it, you will smell a thick earthy fragrance, and this smell every experiment, The jade of the pit will exist. On the contrary, there will be a pungent sour taste or a skunk odor. 4. When playing, the place with calcification will slowly change back to the nature of jade. According to the weight of calcification, the time is long and short; the color of the soil in the jade will gradually become lighter, but it will not completely disappear; the jade of white matter There will be a very light reddish-brown color; in the playing, the ochre that is invisible on the surface will gradually appear. After a complete change, the jade will become transparent and moist. 5, put the jade into the warm water of about 80 °C, calcified, will continue to emerge from the cracks of small bubbles. Because the internal molecular structure is changed after calcification, the looseness will absorb water, and this phenomenon will not occur without the calcified part. 6. Put it in water or dip it with water. If you knead it with water, you will feel a sticky feeling. And every time, it will be so until the game is transparent. Soaked in water, the jade table will precipitate a layer of sticky material, the so-called pulping. 7, the utensils in the play, there will be a layer of gray skin after seeing sweat or water. The ashing phenomenon depends on the degree of dryness and wetness of the pit environment, pH, and material in the pit. 8, with PH test paper test, the basic will be neutral, rarely weak alkaline. It is also determined according to the local soil pH. 9. Jade has natural cracks. This is because jade is in the ground for a long time and is affected by geothermal heat and ground moisture. That is what we often say "the ten jade and nine cracks." This is also an obvious characteristic of unearthed jade. 10, unearthed jade has a yin and yang surface, because of the influence of ground moisture, ground temperature, minerals, etc., the change of the sun surface is smaller than the change of the shade, that is, calcification, ochre, corrosion and so on. 11. Look at the reflection: Because the ancient jade is made by hand, due to the uneven force, the processing surface will be composed of many small faces, which will be uneven, so there will be different reflections when looking at the light. 12, look at the knife: knife and stationery must meet the characteristics of the times. The ancient jade processing technology is made of cooking utensils. Due to uneven force, the scar will appear coarse in the middle, thin at both ends, deep in the middle, shallow at both ends, and different depths of the gully, and the edges of the culvert rarely appear. Crashing phenomenon. When the twist line is turned, a broom shape (or feather shape) will appear. This is because the cookware cannot be continuous when it is bent, and it needs to be connected one by one, so this phenomenon occurs. Some jade articles do not see this phenomenon, which is the reason for repeated grinding after the initial processing of the tweezers.
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February 12, 2021