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Wool fibres are approximately circular in cross section at the macro scale, and have scales on the surface of he shaft. It is these scales that give wool its felting ability.

At a slightly larger scale, some wool is quite crinkly - Merino wool is an example - and this gives the wool its soft feel, particularly in fine wools.

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13y ago
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11y ago

Smooth surface, cross section is triangular with the point of the triangular rounded off.

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Q: What does a wool fiber look like under the microscope?
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