As the market price of South Red Agate has risen all the way, imitation South Red Agate has also begun to appear on the market. The common imitation South Red Agate is divided into the following categories.
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 gorgeous 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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