Dyed gemstones are pigments, chemicals, animal blood, etc., which dye colorless or light-colored stones to bright colors to achieve good gem color effects. Among them, jade is more common, and almost all kinds of gemstones exist, but it is a common problem. Dyed gemstones Changing a colored gem means that it is artificially treated to add color or discolor. Such as gray, gray-blue agate, burned at high temperature, making it brownish red. The most common color-changing topaz (recognized in the market), the colorless and transparent topaz (relatively high yield), irradiated by rays (such as y-rays), turns into blue topaz (small amount) Can be yellow). Common dyed gemstone varieties First, jade The value of jade is mainly determined by the color. The brighter the color, the higher the value. However, most of the jadeite materials are white or light-colored. By artificially dyeing the pigment into jade, a good color effect has been achieved to counterfeit jade. Dyed jade is also known as C goods. Dyeing jade, no matter what color is dyed, it can be seen by strong light. Precipitation in the crack is usually selected from jadeite with a certain degree of cracking. By heating in the dye and soaking for a long time, the color penetrates into it to improve the color. It is also the case that the dye penetrates into the structure of the jadeite, and the color of the dyed jadeite is easily concentrated in the small cracks, and is distributed along the crack in the grain gap near the crack, and is distributed in a mesh form. Before the soaking, the dilute acid is used to wash away the oil stains and surface impurities, and the jadeite is also left with pickling lines. These two are important features for distinguishing dyed jade. Second, crystal Crystals are usually colored in deep colors, and the price is also divided into shades. Therefore, crystal dyeing is also very common. It is bound to be a large wholesale market and there are many such goods, which are common in citrine and powder crystal. There are also common varieties "popcorn crystal" Dyeing powder crystals, also see the dyeing traces to see the dyed crystals in the color-concentrated slits. The crystals that are processed repeatedly have a large loss and the internal structure changes. Bad merchants will use this to pretend to be a watermelon tourmaline. Crystals that pass through the heated crystals are quenched in the dye solution, resulting in dyed variants due to dye penetration. The color of the slightly dyed crystal is not deeply penetrated, and the color will fade after a long time. The interior of the heavily dyed crystal varies greatly. Third, pearl Dyed pearls are more common and are not easily identifiable and need to be enlarged to resolve. The dyeing of pearls is usually done by soaking dilute silver nitrate and aqueous ammonia solution, which makes the color of the pearls very similar to the natural pearls of the same color, and the treated color is stable to light and heat. Dyed pearls, black pearls concentrated in the pearl layer, under the conditions of magnification, it will be seen that the dye is concentrated near the bead hole or distributed in the veins throughout the bead. Fourth, coral Corals are better with red color, while most corals are white, and a lot of dyed corals appear to improve color! Carbonate corals can be dyed. Magnification observation shows that between the calcite particles, the color in the crack is deep, and the dye can be wiped off with a cotton swab dipped in acetone. Natural black coral is shiny and dull after dyeing. Five, turquoise Use light green, moon white turquoise, and put it in blue aniline dye. It can be artificially dyed by means of a colored material such as blue wax or blue plastic, which is difficult to identify. Dyeing turquoise, a drop of ammonia on the unevenly colored turquoise, the dyed blue will fade. In addition to the conventional gemstone physical properties test, the dyed turquoise is also identified by a combination of infrared spectroscopy and X-ray diffraction. Six, corundum The gemstone is heated and quenched to form a microcrack and then immersed in the colorant, and the color of the precipitated pigment is a gemstone color. Dyes and oils are sometimes used together to improve the color of corundum. Use a magnifying glass or microscope to observe the presence or absence of staining in the color. At the same time, you can use a cotton swab filled with acetone to wipe the gem to check. Seven, Opal There are many methods for opal dyeing, which is probably determined by the nature of the opal porous. Because the black opal is loved by people, the most common color is the black opal. The color of the "black" opal treated by sugar acid is more rigid and relatively floating, and the granularity is obviously more than the sugar acid method. This method can blacken Australia's gangue opal. This opal contains many kaolinites. The white light scattered by kaolinite makes the opal's color dim and the color change is not obvious. After blackening, the excess white light is absorbed by the black charcoal deposited in the pores, thus enhancing the color of the opal, making it look like a high-grade opal. Eight, lapis lazuli Poor quality lapis lazuli is often dyed to enhance color effects. Careful observation of the dyed material reveals that the color is enriched along the gap. to sum up The gemstone material that is usually treated contains a certain degree of porosity (porous loose or multi-cracks, cracks) so that the colorant can be immersed inside the gemstone. For gems that do not have pores, it is necessary to artificially create pores or cracks so that the colorant enters the crystal. Therefore, dyed gemstones usually have two major characteristics: crack cracking and loose porous structure. Polyester Cotton Dobby Fabric,Yarn Dyed Dobby Shirt Fabric,Polyester Cotton Solid Dyed Fabrics,Poly Cotton Dobby Printed Shirt Fabric Shaoxing City Yongteng Textile Co., Ltd. , https://www.yongtengtex.com