Regarding the phenomenon of “starting the cottonâ€, in recent years, some collectors or consumers have proposed similar problems in the collection or purchase of Huanglong jade or jade carvings. Let us analyze it below:
1. What is "mian"?
“Mian†is more or less present in all kinds of jade materials including jadeite. “Mian†is a translucent to slightly transparent white, yellow-white cloud-like, irregular mesh in jade. , a vein-like light-colored floc.
In different jade species or colored stone products, "mian" is more or less present, and some are even used as one of the basis for authenticating its authenticity. Rutian Huangshi's "radish silk" is also a kind of radish silky cotton.
2. How is “Mian†formed?
There are two main ways of forming both primary and secondary:
First, the "original generation cause": underground ore-bearing hydrothermal fluid, with the decline of the temperature and pressure of the ore-forming environment, in the complex process of pulsating condensation into jade, it will promote the appearance of jade in the jade. "Native cotton" with inconsistent characteristics.
Second, the “post-generation factorâ€: jade material has been exposed to the surface of slopes and river beaches for a long time, and has been invaded and weathered by wind, frost and rain for a long time, especially after long-term exposure to the sun, so that the jade becomes thick and the surface is jade. The quality is dry and "small".
3. The harm of "mian" in jade and jade carvings?
The appearance of "mian", if only in the secondary part and the amount is small, weak and inconspicuous, has little effect on the quality, but indicates that it is natural jade. However, if the "mian" is too much and obvious, it will obviously lose the moistness and head of the jade, and greatly reduce the grade of jade and jade carvings.
4. Which jade materials are warm and "no cotton", which jade materials are easy to "give cotton"?
Dafan's high-quality puddle seed material, high-quality tiankeng seed material, high-quality mountain stream water meat material, high-quality shank meat material, high-quality sloping meat material, high-quality original sealing stone, high-quality slag stone and other jade materials have relatively low yields. , often get satisfactory quality "no cotton" jade materials and products.
The ordinary, jade flesh, jade meat thickness (pulse width) and morphological changes are extremely unstable, and the thick skin "dry material" that is close to or exposed to the surface and has been weathered and exposed for a long time, its "production rate" Both are higher.
Therefore, when selecting and picking materials, we must pay attention to the category and grade of each jade material; this is crucial. Those involved should learn and practice more, and master the skills of identifying and distinguishing Huanglongyu's categories and grades, paying attention to the practical experience of accumulating and identifying jade species and distinguishing between good and bad.
5. How do jade materials and carvings “except cotton�
More "mian" and obvious "mian" can not be removed, "mian" on the surface, and "mian" which is not obvious, often used to hide by oil.
The principle is that the "oily" infiltrates into the micro-pores and micro-cracks that make up the "mian" to dispel the air inside, so that the density and refractive index between the dense jade and the "mian" gradually approach, so "mian" It disappeared temporarily and disappeared. Only when the oil quality of "oil-raising" was gradually lost, "mian" gradually reappeared.
Therefore, the oil for oil maintenance must be a transparent, colorless and highly stable "non-drying oil" which is not easily lost, and it is most desirable to use a "non-drying oil" having a refractive index similar to that of Huanglongyu.
6. How can I choose jade and jade carvings that will not be "mian"?
As mentioned above, "mian" is due to the difference in density between the inside and the outside of the "cotton body", and the light scattering will "make out"; the unobvious surface layer "mian" can be temporarily disappeared by the "oil-fed method" and disappeared.
Therefore, when selecting materials and judgments, don't be overly optimistic about the “fried fruit†or “oily carved pieces†that are covered with a layer of plastic film and then opened.
When you have to purchase, after obtaining the owner's consent and support, first suck the oily oil with the oil-absorbing soft paper, then use the warm washing powder to remove the oil until the oil is cleaned, and then the water vapor is dried and dried. . If you are not at ease, please ask the owner to use a hot hair dryer for haircuts to slowly heat up for 1-3 minutes from the jade material 0.3 m (0.5 m in engraving).
In general, after the above simple processing, if there is "hidden", you can observe it with a magnifying glass; otherwise, you can't see the "mian" under the magnifying glass, there is no big problem.
The insurance practice is: it is best to buy jade or processed products that are not over-used, and should focus on the oil-free jade or oil-free, micro-oil processed parts that have the original purpose of natural jade.
1. How was the “jade color†of Huang Longyu formed? Is the color of jade stable?
Huanglongyu's cool-toned jade color (black, gray, green) is made of low-priced (divalent) iron ions. Huanglongyu's warm-toned jade color (red, orange, yellow and other complex colors) is High-priced (trivalent) iron ions are colored.
The ideal environment for human habitation, as long as it is not subject to fire, barbecue, cooking, and exposure, there will be no more fading, so it can be said with certainty that the yellow color of Huanglongyu is the most stable.
2. How do you view Huang Longyu's "fading phenomenon"?
"Fade phenomenon" refers to the phenomenon that the chromaticity (concentration of color quality) is reduced or weakened to varying degrees. Huanglongyu appears to fade, mainly in the middle and low-grade ordinary Huanglongyu “dry materialâ€. After the harvested, the jade material is often raised without any exception by the method of “oil raisingâ€, hoping to restore its vitality. To achieve "warm and colorful" as early as.
After the oil-cultivation "dry material" has been carved and processed, it will continue to "preservation" through "oil-raising" quality and color enhancement. Therefore, although the purchase price is low, it has buried quality problems. This is the root cause of the "fading" of ordinary "dry jade" due to the phenomenon of "dehydration and light scattering".
3. What are the mechanisms and influencing factors of Huang Longyu's “fading†phenomenon?
The biggest mechanism of formation is nothing else, mainly in Huanglongyu's ordinary jade or medium-low grade jade. The micro-pores and micro-cracks between the micro-particles are caused by the mechanism of “dehydration and light scatteringâ€.
In addition, there may be an influential mechanism of the "color-induced colloidal iron oxide dehydration conversion" that has not been studied clearly. Is it more or less the influential factor of Huanglongyu's "coloring" or "tone conversion"? the study.
4. What is the specific performance of Huang Longyu's “fading†phenomenon? What is the reason for fading?
Someone bought a bracelet, and the jade color was yellow and orange. One wears one and one is sold on the counter. In the past few months, one of the wearers was warmer and more energetic than when they were purchased. One of the counters was not only warmer but also faded (fading). The reasons for this type of analysis are:
The first situation: one wearing a high-quality seed material (according to common sense, a little better to wear), the counter is made of general mountain pit materials, and the afternoon counter is also exposed to the sun.
The second case: Both are made of mid-range mountain pit material or mid-range puddle meat material, wearing the moisturization of subcutaneous fat and sweat secreted by healthy human body, and “smoothing†the micropores on the surface of the bracelet. Through the "human support" and played the role of "oil".
In short, no matter what jade species, there may be different degrees of fading in the finished product, but because there is no corresponding control, it is generally difficult for the naked eye to detect or make a clear judgment. And as long as it is not an artificially dyed ornament or engraving, its jade color is not easy to recede.
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