Polyester and nylon fabrics have the same shape under the microscope. We need to use a lighter to burn them. After burning, the black smoke will be particularly obvious and smell a little sweet. This is polyester. Look at the other one, the fire is small after burning, and it has no smoke or a little white smoke. The smell is very pungent, which makes you feel uncomfortable. This is nylon. So polyester and nylon can't be distinguished only by their appearance