Red coral is an organic gemstone with a pleasant color and a lustrous texture. It grows in the deep sea of ​​100 to 2000 meters. It is also listed as one of the three organic gems together with pearls and amber. It has also been listed as one of the seven treasures in the Eastern Buddhist scriptures. It has been regarded as a rich and auspicious thing since ancient times.
Natural red corals grow very slowly and are not regenerable. Red corals grow only in several straits (Taiwan Strait, Japanese Strait, Baltic Strait, Mediterranean Sea) and are restricted by the sea. Red corals are extremely precious. The ornaments made of red corals are very popular among collectors, and the boutique red corals are very value-added and are valued by collectors.
The preciousness of red corals has led to the profit-making of profit-making people. From the Republic of China, there is a “celluloid†of pure chemical products. The glaze is burned outside the material, and the lead is coated with lead, coated with a layer of coral paint and painted. Out of texture, and carved into a round bead with ox bone or talc, into the red, is a counterfeit and fake device sold as a coral.
Some of these falsification methods have been passed down to the present, but it is not difficult to identify them: the “coral†made of materials contains bubbles inside, and the broken place is bright, there is no real coral fingerprint pattern; the “coral†made of glass is The shell-like fracture, while the real coral gap is smooth; the "coral" made with the surface is shiny, the cracks occur for a long time, the sound of the phase is boring; the "coral" dyed with bone horny is only wiped with acetone. It will be true and false.
Contemporary coral fraud uses advanced science and technology, such as white coral or coral-like sea bamboo, laser color, "Gilson coral" synthetic coral, etc., very concealed, if there is no rich experience or science If the instrument is tested, it will be easy to fish.
First, look at the texture
Red corals have longitudinal lines parallel to the direction of coral growth and are arranged more closely. Outside the cross section of the red coral, there is a ring like the annual ring of the tree, so pay attention to the two textures when identifying the naked eye.
Longitudinal view: Coral has parallel growth patterns in the longitudinal direction, parallel to the coral column. If it is a ring face, it is usually on the back. If it is an engraving, it will be on the surface.
Horizontal view: The cross section of the coral has growth patterns like annual rings, from small to large. Concentrically growing lines are generally visible on coral ornaments.
Second, look at the color
The color of the red coral is a vivid red color, whether it is shallow or deep, it is alive, not dead, not stagnation! And the red coral has a bright waxy luster, while the dyed red coral has no luster and the color is also stagnation. Dead.
The color of the coral is from the inside out, for example: a coral column, the closer to the surface, the darker the coral, the lighter the inner layer. In other words, the color of the coral is uneven. If the color of the coral is consistent inside and outside, it is suspected of being fake.
Third, listen to the sound
Real corals look delicate but have a crisp, tough sound when they collide with each other. Generally, plastic or other fake corals do not have such a hard and crisp sound. This sound is particularly evident on dendritic corals.
Fourth, the weight
Coral has a good sense of weight, and it is generally a heavy feeling that does not match the delicate feeling of the palm. This component is also one of the basis for identifying red corals and some inferior counterfeits.
5. Identification of natural corals and dyed corals
Dyed corals are usually dyed with red and other colors of white corals with organic dyes. The distinguishing feature is that the dyes are enriched in the cracks, and the internal color is dark and the internal color is shallow. The surface is different. The cotton sticks with acetone are used. Being dyed.
Identification of stained corals depends on the degree of staining. Where dyed, the gloss is not soft and natural, too fascinating, red has no layer, and the real red coral is candle red, red is layered, and some even red and white, the middle reveals a "fingerprint" (the texture of calcium-containing coral and Human fingerprints are similar), which is quite different from dyed imitations.
White coral staining: commonly known as sea bamboo, it is characterized by a very pronounced vertical texture.
Filled coral staining: It is a loosely-formed shallow sea reef coral filled with a glue injection method. Features: smooth surface, rough and fragile, easy to change color.
Synthetic coral dyeing: Various shellfish and gelatinous corals are ground into powders, molded into coral shapes without natural texture.
Various jade imitation corals: dyed with dolomite and calcite. Features: This stain will fade very quickly if not handled properly.
Plastic-dyed coral: Red coral dyed with plastic products. Features: 1 texture is very light; 2 easy to fade; 3 no natural texture, luster.
6. Identification of natural corals and imitations
Coral replicas are commonly found in dyed marble, red glass, red plastic, and "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.
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