Appearance of jade. The appearance of Mo Cui is like ink, the texture is tight and solid, the black is evenly distributed, opaque, but it can completely transmit light. Under transmitted light, it shows green. Other minerals whose appearance is pure black, such as serpentine, black agate, obsidian, hornblende, jade, etc., have different physical properties such as hardness, refractive index and specific gravity. Compared with the ink, these black minerals or appearances are dark green or black, and they are not transparent. By mastering these characteristics, it is easy to distinguish between the two. Inspection and identification of jade. Ink is composed of a single mineral omphacite with a omphacite content of over 90%. The Mohs hardness is 7, the relative density is 3.34 ~ 3.44, and the refractive index is 1.667 ~ 1.670. It is easy to identify the omphacite properties of the ink green using the characteristics of relative density, refractive index and infrared spectrum. Elastic fabric mainly refers to the fabric woven or woven from nylon, Lycra, modal and other fibers, or the above fibers are blended with cotton, hemp, silk, wool and other fibers. It has the characteristics of large elasticity and not easy to deform. It is suitable for the production of tight clothing, such as underwear, swimsuit, sportswear and various coats, or for stage performance clothing such as dance and acrobatics. Stretch Fabric,Twill Two Way Stretch Fabric,150D Four Way Spandex Fabric,150D Four Way Elastic Fabric WEIHUA TEXTILE , https://www.weihuatex.com