Red corals have been imitations for a long time. As early as in the Republic of China, "red corals" made of chemicals were used in the market. With the development of modern technology, some technology companies have developed synthetic red. Coral, this synthetic red coral can deceive ordinary consumers and newcomers who have just entered the line, but as long as you can identify the true and false by careful study, let me introduce how to identify synthetic red coral. 1. Synthetic red corals are made by using calcite powder with a small amount of dyeing agent or by mixing various shellfish or artificial corals into powder, which is compressed or sintered at medium and high temperatures and high pressure. Second, the synthetic red coral has large color changes, is opaque, and has no organic matter in natural corals. After high pressure compression or sintering, it does not have the structure and texture of natural red corals; Third, the shape is mainly granular structure, waxy luster. Fourth, the density is 2.44 smaller than natural red coral (density is 2.70), which is lighter than natural coral under the same volume. Fifth, the hardness is 3.5-4.0, which is less than 4.2 of natural red coral. Thick Satin Fabric,High Quality Satin Fabric,Polyester Thick Satin Fabric,Recycled Polyester Satin Thick Fabric Shaoxing Linkloom Import and Export Co.,ltd. , https://www.linkloomtextile.com