Buying silk is "four coups" 1. The appearance of high-quality silk has a pearl-like color and diffuse refraction of light. Clean and less impurities, the silk road is orderly and tidy; and the poor quality silk is often added with bleach and other chemicals, the appearance is pale, not shiny and moist, more impurities, silky roads. 2. The high-quality silk touch is smooth, smooth and elastic, and has no hard clumps; while the inferior silk has a soft touch, no flexibility, no moist feeling, and has a relatively large number of stolons, clams, oysters and medlar. Silk with a taste of oily or mildew is inferior. 3. When burning real silk, it immediately turns into ash and burns quickly. It is loosely gray after burning and has a burnt smell of hair. 4. Fiber strength The better the silk stretch, the better the quality. The same long silkworm, after stretching, the longer the better the quality. 
Compared with quilts and chemical fiber quilts, silk is selected from 100% pure natural silk and refined by original scientific technology. It has the characteristics of close-fitting and health care. Silk is not the best in the shackles, it has five major health functions, is a rare bedding. The following is the "four coups" that silk is purchased.