How to check natural fabric or not.

 How to check natural fabric or not. To check the natural fabric or not, you need to tear off if you can, or cut off a thread or a piece of a small one two millimeters wide and two centimeters long and set fire to a small ball to roll, then rub it between your thumb and forefinger. If the ball is dense, then it is synthetics, if it is ground into powder, then it is natural fabric. Also with threads.