How is red coral identified? do you know? If you don't know, let Xiaobian come to introduce you. Here is a detailed introduction to the identification method of red coral. The following are the following:
First of all, if you are a red coral player, please first find out if your favorite red coral is old or new, sea coral or mountain coral! This is very important. The prices of old sea corals and mountain corals vary greatly.
Second, what I want to say is the sea coral in the red coral! The earliest place for sea corals in China is in Taiwan. The reason is that the world's deep-sea red corals are mainly distributed in three places: one is the sea area of ​​Taiwan, the southern island of Japan, including the Ryukyu Islands; the other is the sea area around the Hawaiian Islands and the waters of the Midway Islands. There is also a Mediterranean coast, dominated by the southern Italian peninsula. The coral reserves in Taiwan's waters account for 80% of the world's total. The above three regions are high-risk areas of volcanic earthquake activity in the world, including volcanic activities near the seabed. The development of submarine volcanic activity provides a large amount of iron, manganese, magnesium and other macro elements to seawater, which provides extremely important material conditions for the formation of red coral. In the process of calcification and compression, the coral bones absorb a lot of red elements such as iron, manganese and magnesium, and finally form a very valuable red coral through the baptism of nature. Its mining strength is destructive mining, and Taiwan has banned mining in previous years.
Third, the characteristics of red coral: 1, the chemical composition is mainly calcium carbonate, in fact, organic matter and water, as well as iron oxide and silicon, manganese and so on. 2, internal structure, with the naked eye or magnifying glass, in the cross section of the coral, you can see concentric circles and radial fine lines, a series of parallel vertical lines can be seen on the surface of the coral, which is formed during the growth of coral Especially evident in red corals. 3, chemical composition: calcium carbonate accounts for about 95%; magnesium carbonate accounts for 2-3%; organic matter accounts for 1.5-4%; and traces of iron oxide; gloss: dull before unprocessed, polished to glass to grease gloss Hardness: 3.5-4; Specific gravity: 2.60-2.70; Refractive index: 1.48; Light: Non-homogeneous aggregate; Transparency: Non-transparent-micro-transparent; Other features: Foaming in acid, no fluorescence reaction.
Fourth, the identification of red coral: 1, the identification of natural corals and dyed corals: dyed corals are usually dyed white and red with other colors of organic corals, the identification feature is that the dye is enriched in the crack, and the external color depth is internal The color is light and the surface is different. The cotton will be dyed with cotton swabs with acetone. 2, the identification of natural corals and imitations: coral replicas are commonly found in dyed marble, red glass, red plastic, "Gilson Coral" made with calcite powder and dye. These imitations do not have the internal structure of natural red corals. They can be distinguished by careful look at the grain; dyed marble granular structure, dyes are enriched in mineral particles, and the test can be done with acetone; red glass can be done very much. Similarly, occasionally see bubbles, from the hardness point of view, the glass is larger than the coral, and does not react with hydrochloric acid; the density of red plastic is generally less than 1.55, heating and taste, and can not react with hydrochloric acid; and the density of Gilson coral is 2.45.
Fifth, the sea coral trading market, Beihai in Guangxi and Guangzhou in Guangdong. The proportion of red corals dyed is very large, and it is impossible to calculate it carefully, hehe! Several dyeing processes: 1. Coral ornaments made from sea willow and sea bamboo. Phenomenon: There is obvious vertical texture and uniform color, which gives people a feeling of stagnation. There is no pore residue left by coral jade. 2, filled coral staining - is a loose texture of the shallow sea dendritic reef coral filled with plastic injection method. Procedure: Shallow sea reef corals - glue filling - appearance dyeing - polishing - made of various coral products. Phenomenon: The surface is smooth, rough and brittle, and the color is easy to fade. 3, synthetic coral dyeing - is a variety of shellfish or reef-building corals into a powder, plastic injection into a variety of coral shapes. Phenomenon: There is no natural texture, almost every coral is the same, and the color is easy to change. 4, all kinds of jade imitation coral products - dyed with dolomite or calcite. Phenomenon: The color is very uniform, but it is easy to fade and has no luster. 5. Plastic dyed corals - dyed into corals with plastic products. Phenomenon: light texture, easy to fade, no natural texture and luster. 6, the most easy to fake real coral called beauty coral is the use of inferior coral or white coral as the core, using special coatings and coral powder layered, and red corals such as small white spots, small black spots imitation and become the most Valuable crimson corals and peach corals can sometimes achieve a degree of realism, which is difficult for consumers to distinguish.
Sixth, the highest level of natural red coral international price is around 450 yuan / gram, the lowest level is also 300 yuan / gram. The price in the Chinese market is relatively low. Our players usually play with sea corals. The price is between 150 yuan / gram - 200 yuan / gram to get a relatively good image. If the price is low, but everyone should be careful! Real players know that Tibet and Mongolia have mountain corals, but they are also filled with some sea corals, which are found in some old parts of Mongolia and are made of coral. The price of mountain coral is much higher than that of sea coral, but the reason why the market has not started is that it is not comparable to the price of sea coral, and the market is full of imitations, and consumers and players will choose sea corals. So this also brings opportunities for the players of the mountain coral, and now the price is low, I see this kind of dark horse for the collection! It must have been a powerful outbreak in the past, not because of funding problems, I must hoard a lot. Therefore, my red coral stickers in the price of friends, often scared, is a normal phenomenon, after all, most people are not too professional.
The above aspect tells everyone how to identify red corals, and can think about it from many aspects, such as characteristics and prices. Through these introductions, have you mastered the simple authentication method?
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