Use your microscope and have a look at your fibers under 250x to 500x
magnification. Flax fibers (linen) have a somewhat bamboo looking
shape. You get the bamboo like segments and when viewed in cross section
there is actually a dark looking (hollow?) centre like bamboo has. Cotton
fibers on the other hand is long with a gentle twisting to the fiber. In
cross section cotton appears as a kidney bean shape. Cotton also has a
dark centre but it is a squashed line instead of the more open looking
centre of linen.
Hope that helps!
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