At present, there are many methods to imitate cyan gold. At present, there are many patterns imitated by cyan gold. The second-class cyan gold with the most appearance can be dyed and filled with glue to improve brightness and color, and also improve the integrity of cyan gold. "In the past, when cyan gold was dyed and filled with glue, it could be distinguished by decolorant. Now unscrupulous merchants will fill the dyed cyan gold with glue, so that the cyan gold will not fade. " Dyed azurite can be identified by "white spots". Generally, azurite with dye is bright in color, but a little blue dye can still be seen at the white spot, which will give people an uncomfortable feeling. Natural turquoise is blue and white. If you see a hazy blue layer in the white part, you should pay attention. It may be fake.
It is difficult to identify this kind of dyed green gold man, because the natural pyrite and calcite in it can also be seen from the color, which is almost the same as the real thing. It's time to observe with a magnifying glass. Under the magnifying glass, the surface of the green gold filled with glue is not smooth and uneven, and there is a resin feeling and turtle crack caused by glue aging, and the colloid substance is in the crack.
There is also a common false azurite, which can transmit light with a flashlight, that is, imitation azurite dyed with quartzite. The imitation kyanite dyed in Shi Ying is dark in color and granular in structure. The color enters along the crack, and the transmitted light can penetrate. Azurite is opaque, white can't be seen and pyrite can't be found. You need to be careful when you encounter this kind of imitation green gold.
1. The real lapis lazuli is a primary color stone, and no one has artificially changed its characteristics. The words "pure natural", "original ecology" and "raw ore" are people's image descriptions of the original color azurite.
The green gold handicrafts, ornaments and jewelry products produced on this basis are genuine green gold. The testing certificate can be issued by any authoritative testing department.
2. The additive cyan gold is chemically dyed cyan gold. Chemical dyeing of kyanite can be divided into organic chemical dyeing and inorganic chemical dyeing. Organic chemical dyeing is unstable on the surface of azurite, and it will fade when wiped with alcohol. Inorganic chemical dyeing is stable on the surface of azurite, and it is not easy to fade when wiped with alcohol. It can be seen that the place where azurite has natural white lines is gray and dark cyan, which is inorganic chemical dyeing. Inorganic chemical dyeing process is more difficult and costly than organic chemical dyeing process.
On this basis, the blue gold handicrafts, ornaments and jewelry products produced are all dyed blue gold. Can't pass the authentic inspection of the authoritative department.
3. Optimizing green gold is a technology to change color by using modern technology. Common methods include injecting glue, pressing oil, chemical bleaching, heating and boiling wax, etc. Glue-injected cyan gold products will show a screen luster that cyan gold should not have. Pressure oil will release oil to the surface when it is baked with fire. Chemical whitening will see traces of white spots covered by drugs that hurt blue and gold blue. When you heat the wax, you will see that the candle on the surface melts.
The green gold handicrafts, ornaments and jewelry products produced on this basis are all optimized green gold. The conclusions of authenticity detection by authoritative departments are not uniform.
4. Synthetic azurite is artificial azurite. After this technology entered China, it was also called "pressing stone green" and "rolling stone green". Synthetic azurite has a low density, with fine debris on the surface, too uniform color and pyrite distribution, and no unique color difference and gold thread of natural azurite.
The green gold handicrafts, ornaments and jewelry products produced on this basis are all synthetic green gold. It's easy to distinguish the authorities.
The second chapter is the classification of green gold-how to distinguish the advantages and disadvantages of green gold? Green gold classification
The advantages and disadvantages of green gold are 1. Internationally, green gold is divided into two grades: gem grade and commercial grade. Here, the simple dichotomy is that the gem grade is "excellent" and the commercial grade is "poor". 2. Lapis lazuli in China is divided into four grades: Lapis lazuli, Lapis lazuli, Jingelang and Stimulus Stone. In the same dichotomy, lapis lazuli and lapis lazuli are "excellent", while Jin Gelang and Tuishi are "poor". 3. Mining in Afghanistan, Beijing Tianqing Baby Crafts Co., Ltd. pays taxes in three grades and nine grades locally.
First-class, third-class, third-class, third-class, and third-class, that is, collection-class cyan, collection-class cyan, top-class cyan, old mine cyan, primary color cyan, coin-class cyan, and raw mine cyan. Description: the first five classes are "excellent" and the last four classes are "poor". The testing techniques involved in old mines, old mines, new mines, new mines and new mines are too professional to be discussed in this paper.
Identification of Pseudoazurite Study on Identification of Pseudoazurite
The optimized azurite is usually azurite after waxing, dyeing and bonding. Identification of collophanite; After the collophanite is broken, it is mainly plastic cementation. We can test it with a hot needle, and the smell of plastic will appear. When we observe with a magnifying glass, we can find that the finished product has obvious fracture structure. Identification of dyed azurite: However, for azurite formed by boiling batik, it is actually easy to distinguish between luster and color, and they often appear unnatural. Dye cyan gold, dye cyan gold with bad color into cyan gold with beautiful color. The dyed blue-gold color is even, and sometimes the color is too dark to concentrate together. When observed with a magnifying glass, dyes can gather at cracks. Wipe off the color with a cotton swab dipped in acetone or alcohol. Simple identification method: Afghan green gold generally contains white impurities. Of course, the less impurities, the better the grade, and the best without impurities. However, as long as there is a little white spot, it means that this cyan gold has not been dyed. If dyed, they are all dark blue, and there will be no white impurities. Because white is calcite coexisting with azurite. Dyed azurite will not change color when washed with water, but will partially change color when wiped with alcohol solvent. There is a saying in the market that if a rope is dyed blue, it will be classified as a dyed product. This statement is not reliable. Cyanine itself is a dye, and the blue color on the rope may be the color of the treatment powder existing in the channel. And now organic dyes are not easy to fade when exposed to water. Poor dyeing process will make the dyed cyanine fade in washing powder. A good dyeing process can ensure that the general washing does not fade. Counterfeits are sometimes obtained through instrument testing. They are obviously different in physical characteristics, composition and inclusions.
Identification of imitation azurite Some people also sell materials similar to azurite, such as sodalite, blue Shi Ying, azurite, dyed chalcedony, dyed spinel, dyed jade, imitation azurite and dyed marble, as azurite. These artificial gem crystals have a rough structure, uniform color, no shining golden light in the sun, less cool texture than azurite, and relatively woody feel. Identification: 1, the transparency of natural sapphire is relatively high. Under strong light transmission, blue halo can be seen, while synthetic sapphire is invisible halo. 2. The color is hot, and the sapphire color is mixed. Yellow pyrite, white calcite and a small amount of dark green diopside can be seen, and the synthetic sapphire color is single and uniform. 3. Inclusion The distribution of pyrite inclusions in natural azurite is uneven, and the size of pyrite particles is different, while the synthetic azurite is artificially added, with uniform distribution and fixed boundaries at the particle edges. 4. The density of synthetic azurite is lower than that of natural azurite, and the voids are developed, and the weight increases after being placed in water for a period of time.
Identification of True and False Artificial Cyanine Pierre gilson, a Frenchman, made and sold a material called "artificial" cyanine, which is widely used in Europe. Later, artificial cyanine was called "Swiss cyanine" This material can contain pyrite inclusions, which is similar to azurite. Dropping acid will release hydrogen sulfide, but the difference is that the refractive index is 1.55 and the hardness is 4.5, which is obviously different from azurite. "Artificial" azurite will leave white spots after acid removal, but natural azurite will not. So when dropping acid, pay attention to dropping it in an inconspicuous place. Obviously, white spots are also one of the characteristics that distinguish artificial stone blue. This kind of artificial azurite is different from natural azurite in composition, so it is only similar in shape.
When we understand the authenticity and advantages and disadvantages of the above two chapters, we can make an accurate judgment on distinguishing azurite from artificial azurite or fake lapis lazuli. Further, it is the deepening of academic research in Qing Dynasty.
Through the simplest explanation above, it will help beginners to understand the characteristics of green gold and avoid distinguishing authenticity from good or bad.