A goods:
It refers to the unprocessed jadeite, which has a strong glass luster and a crisp and pleasant voice. The cotton wool inside is similar to the shape of a fly's wing.
Jade A goods have the following characteristics:
1) Jade, under the illumination, due to the reflection of these cleavage planes, many shiny facets can be seen on the surface of jade, usually on the sawed or unpolished surface of jade, which is very obvious.
2) Natural jadeite also has orange peel effect, and its polished surface is often orange peel-like. The reason for this phenomenon is that the jadeite particles in jadeite are arranged in different directions. Other identification features can also be seen through this instrument.
3) All kinds of green jadeites have typical absorption spectrum characteristics. Emerald jade must have three absorption lines caused by chromium in the red light region, which has the so-called stepped characteristics. For green to light green jadeite, the absorption line of chromium in the red light region may not be obvious, generally only the absorption line of 660nm can be seen, while the absorption line of 473nm can be seen in the purple light region, which is generally considered to be caused by Fe (iron).
B goods:
Refers to the jadeite that has been acid-washed to remove impurities. ?
B+C goods:
It refers to jadeite that has been bleached, filled and dyed. Not only after pickling, bleaching, glue filling, but also after artificial dyeing. The color and water head are beautiful. It's not bad as a cheap ornament, but it has no collection value. B+C jadeite, the national standard name is "Jadeite (coloring and dyeing)", which means that natural jadeite is bleached, colored and dyed to change its appearance.
C goods:
Emerald C refers to jadeite that has been cured and dyed. No matter whether it is bleached by acid leaching or filled with glue, all artificially colored jadeites are called C goods.
Identification method of jadeite A, B and C products
1, Identification Method of Jade A Goods
Jade A goods can be judged from transparency, purity, color and appearance. The so-called transparency refers to the "species" of jadeite, which is called "water head" by experts engaged in jadeite industry appraisal. This is a proper term for jadeite, and its length refers to the depth at which jadeite can be transmitted by light. Purity refers to the impurities contained in jadeite, which is a very important criterion for evaluating a commodity. The colors of jadeite are rich and colorful, such as white, green, yellow, red and purple. Color is the first thing that buyers see, and the quality of jadeite is also an important criterion to judge the grade of jadeite. Appearance refers to the integrity of a collection.
In addition to judging from the above four aspects, the identification of jadeite also has an external condition, that is, carving and design. Sculpture and design can add a lot of color to jade, of course, the price of fine carvings will naturally be high.
Generally speaking, transparent or almost transparent jade has the highest value, followed by translucent jade and opaque jade, which is called "new jade". Although these three kinds of jade have different transparency, they can all be called jade A goods.
2. Identification method of jadeite B.
1) Observe the internal structure of jadeite by light. Because the jadeite of B goods is soaked in strong acid and alkali, its internal structure will change, it will become loose, and the boundaries of crystal particles will become blurred. Whether the internal structure of jadeite is destroyed is the most important thing to identify whether jadeite is A goods.
2) Put the jade into the glass, pour the water into the glass, just completely avoid the jade, and take out the flashlight to illuminate the light from the bottom of the glass. If there is a bright edge on the sample, the sample is Jade B, and if there is a black edge, it is Jade A. Jade A goods can be easily observed with naked eyes, but there is no way for B goods to see its internal structure.
3) The texture of Jade B is very loose. Examined with a magnifying glass, it can be found that the internal crystal of jade B has shifted, lost its directionality, and its surface is uneven and pitted. If glue is injected into the interior, it will be pink-blue or yellow-green fluorescence under purple fluorescent lamp. On the other hand, the jadeite B on the market is loose in structure, even if it is green, it is dark in color and light in weight. It is hoarse when struck with a hard instrument.
4) The surface gloss of Jade B is insufficient, and it has no spirituality of jade, showing a waxy luster, which is not pleasing to the eye. On the contrary, Jade A goods are in harmony with the background color, which looks generous and natural. Emerald B will look too bright and unnatural after rinsing. Under the action of strong acid, the edge of jade surface will become blurred, and ribbons and color blocks make people feel full of falsehood at a glance, without the aura and vitality of jade.
5) The surface of Emerald B is prone to cracks, and there will be traces of color precipitation on the cracks. If it is jade, even if there is a crack on the surface, there will be no color trace on the crack. The reason is that jadeite B is impregnated with strong acid, and its surface will be eroded by strong acid. ?
3. Identification method of jadeite B+C product
1) Comprehensive observation with naked eyes:
Whether the color is normal. After bleaching, jadeite generally looks fresh and unnatural, with a yellowish feeling. The color dyed green is often too bright and unnatural. Much brighter than undyed B jadeite and much brighter than hand-dyed jadeite. Because its bottom is soaked in acid, it is very clean, and then it is artificially colored, so it is unnatural and easy to touch. People who dye purple can see that purple is evenly distributed.
Gloss-strong or weak reflection. With the same texture, A-quality jadeite is more reflective, while B-quality jadeite is weaker. You can watch it by shaking it slowly under the light.
2) color filter observation.
? B+C goods dyed green will appear red when observed under the color filter, but most of them will not appear red.
3) Observe with a magnifying glass.
? You can see the existence of green dye, which is filled in the pores of the particles and distributed in a network, and can be seen whether it is dyed green, purple or red. But when dyed purple, the real effect can only be seen by observing it under a white light tube.
4) Observe with a visible light absorption spectrometer.
? Infrared spectrum can only solve the problem of whether there is resin in jadeite, so as to determine whether it is A goods or B goods, but it can't solve the problem of whether there is dye. The presence or absence of dyes can be detected through the observation of visible spectrometer. According to our identification experience for many years, the jadeite dyed green and treated with resin has a slightly thicker absorption band in the red region of the visible light spectrum, which is not easy to observe because it is close to the end where the red fades out, so we must look very carefully.
Under ultraviolet lamp: For jadeite dyed green and glued, there is still fluorescence under ultraviolet lamp, but the fluorescence reaction is blue-green to green-blue, which is slightly different from jadeite dyed green and glued, and can be distinguished by careful observation. For jadeite dyed purple with resin, it shows blue-purple fluorescence under ultraviolet lamp, which is different from the fluorescence reaction of pure dyeing or pure resin. Emerald dyed red with resin is inert and has no fluorescence due to the addition of iron-containing dyes. ?
4. Identification method of jadeite C product
1) At first glance, the color feels exaggerated, incorrect and unnatural.
2) Looking at the light, under the transmitted light, or under the magnifying glass and microscope, it can be found that the color is not distributed in the jadeite crystal, but attached to the surface of jadeite minerals or accumulated in the micropores of jadeite, often distributed in a net shape and in a lump shape, without colorless roots. It will be clearer if it is soaked in water or oil.
3) The surface color of jadeite C is thicker, and the deeper it goes, the lighter it becomes, or the color is obviously deepened or accumulated in the cracks and rough structures of jadeite parts.
4) Emerald that changes color by irradiation. Under the mirror or lamp, the green color of secondary jadeite surrounds the surface and is distributed in strips or spots. This kind of C jadeite will turn purple under Charles filter, and it can be faded by adding hydrochloric acid or roasting with fire. At first glance, the jadeite treated by this method is green and moving with good transparency. If you look closely, you will find that its emerald is blue, and there are traces of bombardment on the surface of the jade piece. Compared with non-bombardment, the surface of the former is darker than that of the latter.
5) It is difficult to distinguish between natural red jadeite and dyed red jadeite, because the red color of both jadeite is caused by trace iron ions, but the natural red jadeite has good transparency, and the red part has strong luster and looks "spiritual". The dyed red is dim, thick and uniform because the natural coloring process is slowly formed in nature, while the artificial dyeing changes rapidly in a short time.