1. Burn Test: The burn test is a
quick way to determine the cotton fiber. A few threads from the fiber is moved slowly
to the flame of the burner and then into it. Where it is watched carefully.
Then the sample is removed from the flame still watching it. The fiber sample
is evaluated considering the following point.
a.
Ability to ignition.
b.
Art of burn.
c.
Smell.
d.
Combustion residue.
When cotton ignited it will not
shrink from the flame will burn with a yellow flame. It continues to burn when
the flame is removed and smell like burning paper. There is a little grey ash
residue after combustion.
2. Chemical test:
i. Treatment with H2SO4: With
concentrated H2SO4 the cotton fiber will be destroyed,
i.e. the cellulose components will be dissolved.
ii. Iodine potassium iodide test: The iodine potassium
iodide solution is prepared by dissolving 20gm iodine in 100ml solution of
potassium iodine. The samples are treated some seconds with this solution
followed by rinsing with water unmercerized cotton will not be colored, where
as the mercerized cotton remain longer time dark blue to blue colored.
Thank you for informing your readers about the tests. The burn test is a fast way to correctly identify the cotton fiber.
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