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Before the gemstones are sold, a few will be optimized. The methods and purposes of different types of gemstones may be different, but the ultimate goal is to make them look more beautiful, more valuable, or more durable.
The optimization of red coral includes optimization and processing.
Optimization refers to the artificial quality improvement of the quality of the gemstone. The effect is stable and harmless to the human body. The method is generally recognized by the gemological community and need not be indicated at the time of sale. The goal is to make it look more beautiful, more valuable, or more durable.
1. Bleaching
After the coral is made into a fine blank, it is usually bleached with hydrogen peroxide to remove its turbid color, especially the dead coral, which is cloudy yellow if it is not bleached. Generally, dark corals are bleached to give light corals. For example, black corals can be bleached into golden yellow, while dark red corals can be bleached into pink.
2, dip wax
The method of improving the appearance of the coral by filling the molten wax into the cracks of the coral and the pits on the surface. The main purpose of this traditional improvement method is to improve the appearance, which may have the effect of deepening the color and improving the density.
Processing refers to non-traditional methods that are not accepted by others. When the processed gemstone market is sold, its authenticity must be declared.
1. Dyed coral
The white coral is soaked in red or other organic dyes of other colors to dye the corresponding colors. The simplest method of identification is to wipe with a cotton swab moistened with acetone. If the cotton swab is dyed, it can be identified as a stained coral. In addition, the color of the dyed coral is monotonous and the surface is different. The pigments are collected in small cracks and holes, and the color is deep and shallow inside, and the coloration is uneven. When dyed corals are worn, they tend to fade or lose their luster.
2, filling processing
Fill in empty, inferior corals with materials such as epoxy. Filled corals have a lower density than normal corals; in hot needle experiments, filled corals can be precipitated with resins and the like.
3, film treatment
For the treatment of loose or poorly colored corals, the common material is black coral. The black-coated coral has a strong luster, and the papular protrusions are relatively flat. It is faded with acetone.
Red coral is a rare organic gemstone. The sales of red corals on the market are extremely strict. The number of red corals that can be sold in circulation is extremely small, and the quality of corals is rare. Therefore, some optimization of corals can be done by merchants. Understand. If the consumer has doubts about the quality of the coral, you can directly ask the clerk, and generally get the corresponding answer. If you are not at ease, you can go to the National Jewelry Quality Inspection Center for testing.
Embroidery is a general term for various decorative patterns embroidered on fabrics by needle and thread. Embroidery is divided into silk embroidery and feather embroidery. It is a kind of decorative fabric that uses a needle to puncture silk thread or other fibers and yarns with certain patterns and colors on the embroidered materials, and then forms the decorative pattern with the embroidery trace. It is the art of adding human design and production to any fabric that exists with needles and threads. Embroidery is one of the traditional Chinese folk crafts, which has a history of at least two or three thousand years in China. Chinese embroidery mainly includes Suzhou embroidery, Hunan embroidery, Shu embroidery and Guangdong embroidery. Embroidery techniques include: wrong needle embroidery, random needle embroidery, net embroidery, all over embroidery, lock silk, nasi, Najin, Pingjin, Yingjin, Panjin, fluting, scraping, poking, sprinkling, cross stitch, etc. the main uses of embroidery include life and art decoration, such as clothing, bedding, tablecloth, stage, art decoration.
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