1, artificial baking color The principle of artificial baking is that the agate component contains a few chromogenic ions. If only the Fe 3+ ion agate is used, the natural red color will appear. If only the Fe 2+ ion is contained, the green color will appear. Most of the agate in nature also contains Fe 3+ and Fe 2+ ions. Under oxidizing atmosphere, Fe2+ is oxidized to Fe3+ by a simple heating method, and then the gray agate is converted into red agate. The roasted red agate, also known as the East Red Agate in the collection, is distinctly different from the South Red Agate. Baked red is generally less natural. The red color is dark, not bright, and the red feels floating on the outside. From the texture, because the roasted red agate is processed with some light-colored agate, this kind of agate produced in other places does not have the unique gelatinous feeling of the southern red agate, that is, the oily feeling, the general transparency is high, the glass is strong, and the temperature is moist. The characteristic south red has a substantial difference. The main differences are as follows: crispy, easy to show the collapse of similar glass; color boring, commonly known as dead color, lack of clarity, can not reach the true pure red color; there is a slender fire robber under the microscope, which is because of the high temperature. 2. Artificial dyeing Some agate stone containing high iron element itself, by heating becomes red, but mostly not having such feature, so the use of nitric acid oxidation of the first or second ferromagnetic iron solution, dipping a month, and then sodium nitrate After soaking for about two weeks, let it dry and then heat the acidification to make it red. Artificial baking color has a long history in the optimization of agate treatment, and it is also inevitable in recognition. The dyed agate is observed under a high magnification magnifying glass, and it can be seen that the color is scattered along the mesh color which is saturated with the crystal between the crystals, and the glass has strong feeling, and there is no unique fat feeling of Nanhong. 3. Manual injection Injection molding is an optimization method for the beginning of Southern Red. The original stone coated with glue is more easily identifiable, and there is a layer of clear inclusions on the outer layer with fine bubbles between them. After the carving, the plastic red Nanhong is more difficult to identify. Careful inspection will reveal that there are currently lines of bright lines that are as thin as silk. Generally, this kind of bright line pattern is relatively straight, and the ordinary penetration is long, even throughout the whole. This natural line between the bright line and the south red is inevitable, which occurs after the filling of the epoxy glue. 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. The Liangshan South Red Producing Area also produces a lot of red sapphire. The volcanic red sapphire skin shell and the Liangshan Nanhong are exactly the same, and the surface cannot be accurately identified. The outer layer of the volcanic red bilith also has a high-temperature oxidized brown to iron black husk, which is intricate in size, ranging from small beans to tens of kilograms of large rough. The integrity of the volcanic red stone is very good, there is no crack at all. The toughness is higher than that of Liangshan Nanhong, 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 mottled impurities. Under the daylight, the red stone is opaque, even under the special high-light flashlight of jade , the stone is simply opaque. 5. Feeder The material can be made into a bright, semi-clear and even unclear shape according to the demand. The biggest difference from the natural south red is that it is non-greasy, and the inevitable bubbles can be seen under the high magnification magnifying glass. The physical characteristics of the feeder are brittle and the section is glassy.
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4. Hongbi Shi
As the market price rises, the South Red Agate counterfeiting and alternatives are everywhere in the market. The following are often seen.