How to identify a Cotton Fiber

We can identify a cotton fiber by two ways. There are mainly these following ways. Besides this there are also lots of test. But I think this are the most popular among them. And these tests are followed by everywhere in the world. So I would like to discuss about the most popular testing system of Cotton fiber.

1. Burn Test
2. Chemical test

1. Burn Test : When ignited, it does not shrink from the flame and burns with a yellow flame while in it. It continuous to burn when the flame is removed and smell like burning paper. There is little grey ash residue.

2. Chemical Test with H2SO4 : This is one of the very important test i ever known. Because, in the buyer requirements it must be done before preparing the yarn. Its done by the following way.
With concentrated Sulfuric Acid, the Cotton fiber is destroyed.
i.e; the cellulose components will be dissolved.