1. Observe the gloss. The luster of real silk is soft and uniform, bright but not glaring. Although the luster of rayon fabric is bright, it is not soft and pleasing to the eye. Although the luster of polyester yarn is uniform, it has glitter or shiny yarn. Nylon silk fabrics have poor luster, as if they are coated with wax.

2. Feel the hand. There is a handle feeling when you touch the silk fabric, but other chemical fiber products do not have this feeling. Rayon fabric is smooth and soft, but not stiff. Cotton silk weaves are harder to touch but not soft.

3. Check the crease carefully. When the silk is squeezed tightly and then released, there is no crease because of its elasticity. Rayon fabrics have obvious creases after letting go, and the creases are difficult to restore to their original shape. Although polyamide silk spun has creases, it can slowly return to its original shape, so don't be confused by its false appearance.

4. Test the fiber tension. Pull out a few fibers at the edge of the fabric and wet it with your tongue. If it is easy to break at the wet place, it is rayon. If it is not broken at the wet place, it is silk. If the fiber is in a dry and wet state The strength is very good, but it is not easy to be broken by nylon or polyester.

5. Listen to the sound of friction. Because the surface of the silk is protected by sericin and is resistant to friction, dry silk fabrics will make a noise when rubbing against each other, commonly known as "silk sound" or "silk sound"; while other chemical fiber products appear silently.