There is a very simple method-burning. Through burning, pure cotton will not play with fire, burning quickly and completely, without black smoke and pungent smell. The product of combustion is ashes that can be crushed into powder.
Others, such as polyester, have black smoke and pungent odor after burning, and the combustion products are similar to plastic after burning, hard and difficult to crush.
You can tell whether the cotton soft towel in your hand is 100% cotton through this simplest method.
