The texture of South Red Agate is exquisite in China. It is a unique species in China. Its production is scarce. It has been exhausted during the Qianlong period of the Qing Dynasty, so the price of old South Red Agate rises every year. The ancient red agate used in ancient medicine to raise blood and nourish the heart. Believing in Buddhism believes that it has special effects. The red pearl (the true pearl) in the Buddhist seven treasures refers to the southern red agate. The main point of characterization is to put the South Red Agate close to the glare. Looking at the glare, it can be seen that the red color of the South Red Agate is a red color formed by the accumulation of countless cinnabar points. This feature is not available in other agates, if it is very red. The southern red agate, the light can not be penetrated, this identification method does not apply. With the development of geological exploration and the discovery of new veins, the current South Red Agate is mainly a new mine in Baoshan, Yunnan and Liangshan, Sichuan. The southern red agate produced by Baoshan in Yunnan (that is, the origin of Laonan red agate) has good quality and is very close to Laonanhong, but the gelatinity is worse than that of Laonanhong, and it is still different from Laonanhong. Laonanhong was mined on the cliff in ancient times. Now Baoshan material is mined in the mine. The high-end Baoshan material is ruddy in color, but the disadvantage is that it is not easy to produce large pieces of material; the other is Produced in Liangshan, Sichuan, the color is slightly different from that of Yunnan Baoshan. There are several mine mouths such as Jiukou, Wasi, and Union. It has many different colors such as persimmon red, rose red and cherry red, which is easy to produce large pieces.
Some characteristics of South Red Agate
ã€color】
South red agate. The common color is the persimmon yellow of Gansu. (Orange red), red, pink. There are also uncommon purples, as well as transparent or translucent variations of these colors, including the colorless, nearly transparent, which is roughly defined as the color scale of South Red. And the white color of the animal head agate cup grain is more than the situation, there are ribbons like the texture is also white and red half and half. Note here that the pattern of Nanhong is very sharp, and all the lines will have obvious angles when turning, (one of the important criteria for judgment) gives a clean and sensation. (That is to say that red and white are distinct!) In addition to the white color of the red color, there will be no other changes in the red to the transparent change (sometimes mixed with some associated minerals, black or turquoise).
[Texture]
On the texture, Nanhong is a gelatinous texture. Even if the red beads are not opaque, you can see that the color is transparent from the inside to the outside. On the contrary, even if the colorless beads have a feeling of embarrassment, it is noted here that this texture is temporarily unpreparable unless it is new. Therefore, the fake South Red is basically made of pure red.
[Weathering pattern]
On the outer appearance of the beads, most of the old beads, especially the old chalcedony/agate beads will have a half-moon-shaped weathering pattern. This kind of grain is mainly due to the long-term use. The beads and other valuable valuable old beads have appeared in the new imitation. The weathered lines made by the tapping, but it is obvious that the surface powder and the water-fermented pulp do not match, and the size is uniform, dull, and the texture is dull (the crescent-shaped interior, the old weathered grain new moon has Glossy) But here, I noticed that the dyed Nanhong, which is produced in large quantities, has been weathered, and most of the cracks on the surface of the agate made by direct high-temperature burning.
[punch and hole]
The punching of the red agate is very unique. It may be double-sided punching and then beading (the hole will not be small). After a long time of use, the hole wear is very smooth. South red agate, the name itself is a mystery, no one knows exactly when Nanhong's title originated.
[finished shape and patina]
In terms of shape, the south red material is small, and the uniform color is smaller. Therefore, all the big ones will be used as ornaments, and the small ones will be used for beads or pendants. In addition to pendants, common olive-shaped pieces, positive beads, drum-shaped beads, barrel-shaped beads, wheel beads, abacus beads, melon beads, septa, drop-shaped beads (droppers), mostly round beads, also have Various carvings made by the block.
Market substitute
As market prices rise, the South Red Agate counterfeiting and alternatives are everywhere in the market. The following are common.
Artificial burnt color
The principle of artificial burning is that the agate component contains a small amount of chromogenic ions. If it only contains Fe3+ ions, the agate will show a natural red color. If it only contains Fe2+ ions, it will show a blue-green color. Most agates in nature contain both Fe3+ and Fe2+ ions. In an oxidizing atmosphere, Fe2+ is oxidized to Fe3+ by simple heating, which converts gray agate into red agate.
Burnt red agate, which is the eastern red agate in the collection area, is obviously different from the sense of the South Red Agate. Burnt red is generally not so natural. The red is dark, not glaring, and the red has a feeling of floating on the surface. In terms of texture, since the burnt red agate is processed by some light-colored agate, the agate of other origins does not have the unique gelatinous feeling of the southern red agate, that is, the oily feeling, usually the transparency is high, the glass is strong, and The red color of the warm nature is different in nature.
The main differences are as follows: fragile, prone to glass-like collapse; color boring, commonly known as dead color, lack of clear feeling, can not achieve true pure and bright red; microscopic fire robbery under the microscope, which is caused by high temperature.
2. Artificial dyeing
Some agate roughs have higher iron content and turn red when heated. However, most of them do not have this condition. Therefore, it is necessary to use second iron nitrate or first iron solution for immersion for one month, then soak it with sodium nitrate. After two weeks, let it dry and then heat the acidification to make it red. Artificial burnt color has a long history in the optimization of agate, and it is also difficult to identify. The dyed agate is observed under a high magnification magnifying glass, and the color distribution of the color permeating along the intercrystalline space can be seen. The glass has a strong sense of glass and has no unique fatness of Nanhong.
3. Manual injection
Injection molding is an optimized method that began to appear in modern South. The original stone coated with glue is easier to identify, and there is a transparent inclusion on the outer layer with small bubbles between them. The engraved glued Nanhong naked eye is more difficult to identify. A closer look reveals a transparent line of fine lines inside. Usually, the transparent lines are relatively straight, generally extending a long distance, even throughout the whole. This transparent linear pattern is different from the natural texture in the south red, which is produced by the filling of the epoxy glue.
4. Hongbi Shi
Red bilith is a chalcedony containing mineral impurities such as clay minerals and iron oxide, as well as chicken liver stone and goat liver stone. At the same time, Liangshan Nanhong produces a large number of Hongbiishi at the same time. One of the volcanic red sapphire shells and the Liangshan Nanhong are almost identical, and the appearance cannot be correctly judged. The outer layer of the volcanic red bilith also has a high-temperature oxidized brown to iron black hull, which varies in size from small to large, as well as tens of kilograms of large rough. The integrity of the volcanic red stone is very good, basically no splitting. The toughness is higher than that of Liangshan South, and it is difficult to break the conventional strength. The graininess of the section is strong and the sand surface is poor, the gloss is poor, and there is no fat. The color is mainly red with black spots and impurities. Under the sunlight, the red stone is opaque, even under the special light flashlight for jade, the stone is almost opaque.
5. Feeder
The material can be made transparent, translucent or even opaque according to the needs. The biggest difference from natural south red is that it is non-greasy, and certain bubbles can be seen under the high magnification magnifier. The physical properties of the feeder are brittle and the section is glassy.
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