How to quickly identify pure cotton fabrics?

How can I tell if it is pure cotton before buying it?
Grasping: Grab the fabric with a handful of hands, and then let go. If the wrinkle is severe, it means that the cotton component is ly, otherwise, it is other components.

Look: pure cotton fabrics are relatively light in luster, not strong in reflection, and look softer. The easiest way is to look at the washing water mark of the bedding: 99% cotton.

Touch: The feel of pure cotton fabrics is softer and more comfortable than other textures (except for silk, of course).

The following methods are methods that you can experiment with after purchasing.
Washing: High-count and high-density pure cotton fabrics shrink less, wrinkle after washing, and recover immediately after drying.

Cover: The cotton bedding cover is easy to absorb moisture and does not feel stuffy.

Burning: smoke a piece of fabric fiber or a small piece of fabric to burn, pure cotton can burn, accompanied by the smell of burning paper, the ashes turn black, and can be completely crushed by hand.